diff --git a/lab1/WordCont.c b/lab1/WordCont.c
new file mode 100644
index 0000000..ea2f68b
--- /dev/null
+++ b/lab1/WordCont.c
@@ -0,0 +1,81 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <string.h>
+
+
+int main(int argc, char* argv[]) {
+
+	
+	if (argc < 2) {
+		printf("Usage: WordCount.exe [OPTIONS] filename\n\nFor a list of options use: WordCount.exe -h\n\n\n\n\n\n\n ");
+		return 1;
+	}
+	char* option = argv[1];
+
+
+	FILE* input;
+	char* name;
+	name = argv[argc - 1];
+
+	input = fopen(name, "r");
+
+	if (input == NULL) {
+		printf("File not be opened");
+		return 1;
+	}
+
+	
+
+    for (int l = 1; l <= argc - 2; l++) {
+		char* options = argv[l];
+		int ch;
+
+		if ((strcmp(options, "-l") == 0) || (strcmp(options, "--lines") == 0)) {
+			int CountLines = 0;
+			int word = 0;
+			while ((ch = fgetc(input)) != EOF) {
+				if (ch == '\n') {
+					CountLines++;
+			}
+			fseek(input, 0, SEEK_SET);
+			printf("Opened file contains %d lines\n", CountLines + word);
+
+		}
+
+		else if ((strcmp(options, "-c") == 0) || (strcmp(options, "--bytes") == 0)) {
+			int size = -1;
+			do {
+				ch = fgetc(input);
+				size++;
+			} while (ch != EOF);
+			fseek(input, 0, SEEK_SET);
+			printf("File size is %d bytes\n", size);
+		}
+
+		
+		else if ((strcmp(options, "-w") == 0) || (strcmp(options, "--words") == 0)) {
+			int ch = 0;
+			int isspace = 0;
+			int words = 0;
+			while (ch != EOF) {
+				ch = fgetc(input);
+				if ((ch == ' ') || (ch == '\n') || (ch == '\t') || (ch == '\v') || (ch == '\f') || (ch == EOF) || (ch == '.') || (ch == ',')) {
+					if (words == 1) {
+						words = 0;
+						isspace++;
+					}
+				}
+				else {
+					words = 1;
+				}
+			}
+			fseek(input, 0, SEEK_SET);
+			printf("The file has %d words\n", isspace);
+		}
+		else {
+			printf("Invalid command.\n");
+		}
+	}
+	fclose(input);
+	return 0;
+}
\ No newline at end of file
diff --git a/lab1/WordCont1.c b/lab1/WordCont1.c
new file mode 100644
index 0000000..ea2f68b
--- /dev/null
+++ b/lab1/WordCont1.c
@@ -0,0 +1,81 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <string.h>
+
+
+int main(int argc, char* argv[]) {
+
+	
+	if (argc < 2) {
+		printf("Usage: WordCount.exe [OPTIONS] filename\n\nFor a list of options use: WordCount.exe -h\n\n\n\n\n\n\n ");
+		return 1;
+	}
+	char* option = argv[1];
+
+
+	FILE* input;
+	char* name;
+	name = argv[argc - 1];
+
+	input = fopen(name, "r");
+
+	if (input == NULL) {
+		printf("File not be opened");
+		return 1;
+	}
+
+	
+
+    for (int l = 1; l <= argc - 2; l++) {
+		char* options = argv[l];
+		int ch;
+
+		if ((strcmp(options, "-l") == 0) || (strcmp(options, "--lines") == 0)) {
+			int CountLines = 0;
+			int word = 0;
+			while ((ch = fgetc(input)) != EOF) {
+				if (ch == '\n') {
+					CountLines++;
+			}
+			fseek(input, 0, SEEK_SET);
+			printf("Opened file contains %d lines\n", CountLines + word);
+
+		}
+
+		else if ((strcmp(options, "-c") == 0) || (strcmp(options, "--bytes") == 0)) {
+			int size = -1;
+			do {
+				ch = fgetc(input);
+				size++;
+			} while (ch != EOF);
+			fseek(input, 0, SEEK_SET);
+			printf("File size is %d bytes\n", size);
+		}
+
+		
+		else if ((strcmp(options, "-w") == 0) || (strcmp(options, "--words") == 0)) {
+			int ch = 0;
+			int isspace = 0;
+			int words = 0;
+			while (ch != EOF) {
+				ch = fgetc(input);
+				if ((ch == ' ') || (ch == '\n') || (ch == '\t') || (ch == '\v') || (ch == '\f') || (ch == EOF) || (ch == '.') || (ch == ',')) {
+					if (words == 1) {
+						words = 0;
+						isspace++;
+					}
+				}
+				else {
+					words = 1;
+				}
+			}
+			fseek(input, 0, SEEK_SET);
+			printf("The file has %d words\n", isspace);
+		}
+		else {
+			printf("Invalid command.\n");
+		}
+	}
+	fclose(input);
+	return 0;
+}
\ No newline at end of file
diff --git a/lab2/lab2.1.c b/lab2/lab2.1.c
new file mode 100644
index 0000000..6df8e55
--- /dev/null
+++ b/lab2/lab2.1.c
@@ -0,0 +1,130 @@
+define _CRT_SECURE_NO_WARNINGS
+
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#define Findmax(a,b) (((a) > (b)) ? (a) : (b))
+const int cc = 1e9;  //radix
+
+typedef struct
+{
+    int32_t* int32;
+    size_t size;
+} uint1024_t;
+
+uint1024_t from_uint(unsigned int x) 
+{
+    int size;
+    if (x >= cc) size = 2;
+    else size = 1;
+    uint1024_t t;
+    t.int32 = malloc(size * sizeof(int32_t));// size * sizeof(int32_t)
+    t.size = size;
+    t.int32[0] = x % cc;
+    if (size > 1) t.int32[1] = x / cc;
+    return t;
+}
+
+void printf_value(uint1024_t x)//вывод
+{
+    int size = x.size;
+    printf("%d", !size ? 0 : x.int32[size - 1]); //display significant digits without 9 zeros
+    for (int index = size - 2; index >= 0; --index) //output the result: significant digits are printed at the end of the array
+        printf("%09d", x.int32[index]);
+}
+
+void scanf_value(uint1024_t* x)//заполнение полного массива
+{
+    char str[1024];
+    scanf("%s", str);
+    int len = strlen(str);
+    int size = len % 9 == 0 ? len / 9 : len / 9 + 1;
+    uint1024_t result;
+    result.int32 = malloc(size * sizeof(int32_t));
+    result.size = size;
+    for (int index = len, j = 0; index > 0; index -= 9, j++)
+    {
+        str[index] = '\0'; //убираю нули
+        result.int32[j] = (atoi(index >= 9 ? str + index - 9 : str)); //I take 9 digits from the end, if the index is less than 9, I go to the rest of the line
+    }
+    *x = result;
+}
+
+
+uint1024_t add_op(uint1024_t x, uint1024_t y)//сложение
+{
+    uint1024_t result;
+    int size = Findmax(x.size, y.size);
+    result.int32 = calloc(size, sizeof(int32_t));
+    result.size = size;
+    int32_t over = 0;
+    for (int index = 0; index < size || over; index++)
+    {
+        if (index == size)
+        {
+            result.int32 = realloc(result.int32, (size + 1) * sizeof(int32_t));
+            result.int32[size] = 0;
+            result.size++;
+        }
+        result.int32[index] = over + (index < x.size ? x.int32[index] : 0) + (index < y.size ? y.int32[index] : 0);
+        if (result.int32[index] >= cc) over = 1, result.int32[index] -= cc;
+        else over = 0;
+    }
+    return result;
+}
+
+uint1024_t subtr_op(uint1024_t x, uint1024_t y)//вычитание
+{
+    uint1024_t result;
+    int size = Findmax(x.size, y.size);
+    result.int32 = calloc(size, sizeof(int32_t));
+    result.size = size;
+    int over = 0;
+    for (int index = 0; index < size || over; index++)
+    {
+        if (index == size)
+            break;
+        result.int32[index] = x.int32[index] - (index < y.size ? y.int32[index] : 0) - over;
+        if (result.int32[index] < 0) {
+            over = 1;
+            result.int32[index] += cc;
+        }
+        else over = 0;
+    }
+    while (result.int32[result.size - 1] == 0 && result.size > 1)
+        result.size--;
+    result.int32 = realloc(result.int32, result.size * sizeof(int32_t));
+    return result;
+}
+
+int main()
+{
+    setlocale(LC_ALL, "Rus");
+    uint1024_t num1, num2;
+    char ArrayOfChar[310];
+    memset(ArrayOfChar, 0, 310);
+    printf("Введите число\n");
+    scanf_value(&num1);
+    printf("Введите число\n");
+    scanf_value(&num2);
+    fseek(stdin, 0, SEEK_END);
+    while (1)
+    {
+        printf("Выберете: + - * \n");
+        scanf("%c", ArrayOfChar);
+       if (!strcmp(ArrayOfChar, "-")) num1 = subtr_op(num1, num2);
+        else if (!strcmp(ArrayOfChar, "+")) num1 = add_op(num1, num2);
+        else break;
+        printf_value(num1);   
+        fseek(stdin, 0, SEEK_END);
+        printf("\nВведите число\n");
+        scanf_value(&num2);
+        fseek(stdin, 0, SEEK_END);
+        return 0;
+    }
+    }
+
+ 
+ 
diff --git a/lab3/main.c b/lab3/main.c
new file mode 100644
index 0000000..230451a
--- /dev/null
+++ b/lab3/main.c
@@ -0,0 +1,134 @@
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <stdint.h>
+#define REQ_LEN 2500
+//=======================================ERROR
+void error_5xx(FILE* file1, FILE* file2) {
+
+    char string[REQ_LEN];
+    unsigned int size_of_string = 0;
+    int count_errors = 0;
+    int first_element = 0;
+    int last_element = 0;
+    while (!feof(file1)) {
+        char *check = fgets(string, REQ_LEN, file1);
+        if (check == NULL) {
+
+        }
+        size_of_string = strlen(string);
+        for (int i = 0; i < size_of_string; i++) {
+            if (string[i] == '"') {
+                first_element = i;
+                break;
+            }
+        }
+        for (int j = first_element + 1; j < size_of_string; j++) {
+            if (string[j] == '"') {
+                last_element = j;
+                break;
+            }
+        }
+        if (string[last_element + 2] == '5') {
+            fprintf(file2, "%s", string + first_element + 1);
+            count_errors = count_errors + 1;
+        }
+    }
+    printf("%d", count_errors);
+
+}
+//=======================================TIME
+
+/*char Get_TimeStr(FILE *file){
+    int start_pos;
+    char string[REQ_LEN];
+    char sub_str[20];
+    unsigned int size_of_string = 0;
+    char *check = fgets(string, REQ_LEN , file);
+    if (check == NULL) {
+        return 1 ;
+    }
+    size_of_string = strlen(string);
+    for (int i = 0; i < size_of_string; i++) {
+        if (string[i] == '[') {
+            start_pos = i;
+            break;
+        }
+    }
+    strncpy(sub_str,string[start_pos + 1], 20);
+    return sub_str;
+}*/
+
+
+    time_t Get_time(char *string) {
+        char month[12][4]= {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
+                            "Sep", "Oct", "Nov", "Dec"};
+        struct tm time;
+        time.tm_mday = atoi(string);
+        for (int i = 0; i < 11; i++)
+            if (!strcmp(month[i], string)) {
+                time.tm_mon = i;
+                break;
+            }
+        time.tm_year = atoi(string + 7) - 1900;
+        time.tm_hour = atoi(string + 12);
+        time.tm_min = atoi(string + 15);
+        time.tm_sec = atoi(string + 18);
+        return mktime(&time);
+    }
+
+char *Time_str(char *string){
+
+char *str = malloc(20);
+int i = 0;
+while (*(string+i) != '[' ){
+    i++;
+}
+strncpy(str, string + i + 1, 20);
+
+return str;
+}
+
+
+void Time_Window(FILE *file, long long sec_period) {
+    long int first_pos = 0, sec_pos = 0, count = 0;
+    fseek(file, 0, SEEK_END);
+    char first_string[REQ_LEN], second_string[REQ_LEN];
+    int from_end = ftell(file);
+
+    while (sec_pos < from_end) {
+        fseek(file, first_pos, SEEK_SET);
+        fgets(first_string, REQ_LEN, file);
+        char *data = Time_str(first_string);
+        int firstTime = Get_time(data);
+        first_pos = ftell(file);
+        if (sec_pos > first_pos) {
+            fseek(file, sec_pos, SEEK_SET);
+        }
+        while (sec_pos < from_end) {
+            fgets(second_string, REQ_LEN, file);
+            sec_pos = ftell(file);
+            char *data1 = Time_str(second_string);
+            int lastTime = Get_time(data1);
+            if (difftime(lastTime, firstTime) > sec_period){
+                break;
+            }
+            count++;
+        }
+    }
+    printf("\n");
+    printf("window : %d count : %d \n", sec_period, count - 2);
+}
+//=======================================Main_Program
+
+int main(int argc, char** argv) {
+        int period;
+    FILE *log_in = fopen("123.txt", "r");
+    error_5xx(log_in, stdout);
+    printf(" \n ");
+    printf("Write time period in seconds: ");
+    scanf("%d", &period);
+    Time_Window(log_in, period);
+    return 0;
+}
\ No newline at end of file
diff --git a/lab4/main.c b/lab4/main.c
new file mode 100644
index 0000000..46c06b2
--- /dev/null
+++ b/lab4/main.c
@@ -0,0 +1,173 @@
+#include <stdio.h>
+#include <string.h>
+#include <locale.h>
+#include <stdlib.h>
+#include <uchar.h>
+
+
+#define ID3_MAX_SIZE 128
+
+typedef struct ID3TAG {
+    char signature[3]; // "TAG"
+    char name[30]; // имя песни
+    char artist[30]; // исполнитль
+    char album[30]; // альбом
+    char year[4]; // год
+    char description[30]; // описание
+    unsigned short number_in_album[1];  //номер трека в альбоме
+    unsigned short null_byte[1]; // нулевой байт, проверка номера в альбоме
+    char genre; // Жанр
+} ID3TAG;
+
+/* Возвращает кол-во байт на 128 меньше от общего размера файла */
+long file_offset(FILE* fp) {
+    fseek(fp, 0, SEEK_END); // Устанавливает индикатор на 0 байт от  конца
+    //ftell(fp) - кол-во байт от начала файла
+    return ftell(fp) - ID3_MAX_SIZE; // на 128 от конца
+}
+
+int main(int argc, char* argv[]) {
+    setlocale(LC_ALL, "Rus");
+    FILE* Filein = NULL; // Изначальный mp3 файл
+    FILE* Fileout = NULL; // Изменённый mp3 файл
+    char* mp3_name; // Название mp3 файла
+    char* tag; // Название тэга
+    char* val; // Испрльзуется в --value=val
+    ID3TAG* TAGS = NULL;
+
+    /* Если 11 первых символов argv[1] == 11 первым символам '--filepath=',
+       то strncmp() вернёт 0 */
+    if (!strncmp(argv[1],"--filepath=",11)) {
+        // Ссылка на следующий эл-т после '='
+        mp3_name = strpbrk(argv[1], "=") + 1;
+        // Если файл не открывается то вывести сообщение об ошибке
+        if ((Filein = fopen(mp3_name, "rb")) == NULL) {
+            printf("Failed to open file %s for reading.\n", mp3_name);
+            return 0;
+        }
+    }
+    else {
+        printf("Команда --filepath= не распознана.\n");
+        return 0;
+    }
+
+
+    // Здесь временно будет храниться вся информация из mp3 файла
+    char* temp = (char*) malloc(sizeof(char) * ID3_MAX_SIZE);
+    // Весь массив (все байты) заполняются 0
+    memset(temp, 0, ID3_MAX_SIZE);
+    // Устанавливает индикатор на 0 байт от  конца
+    fseek(Filein, file_offset(Filein), SEEK_SET);
+    //
+    fread(temp, 1, ID3_MAX_SIZE, Filein);
+    // Копируем тэги
+    TAGS = (ID3TAG*)(temp);
+
+
+    /* --show */
+    if(!strcmp("--show", argv[2])) {
+        printf("\nSong Name:     %s\n",TAGS->name);
+        printf("Artist:        %s\n",TAGS->artist);
+        printf("Album:             %s\n",TAGS->album);
+        printf("Year:                %s\n",TAGS->year);
+        printf("Description:           %s\n",TAGS->description);
+        printf("Number in album:           %s\n",TAGS->number_in_album);
+        printf("null_byte:           %s\n",TAGS->null_byte);
+        printf("Genre:               %d\n\n",TAGS->genre);
+    }
+        /* --get */
+    else if (!strncmp("--get=", argv[2], 6)) {
+        tag = strpbrk(argv[2], "=") + 1;
+        if ( !strcmp(tag, "name") )
+            printf("Song Name:     %s\n",TAGS->name);
+
+        else if ( !strcmp(tag, "artist") )
+            printf("Artist:        %s\n",TAGS->artist);
+
+        else if ( !strcmp("album", tag) )
+            printf("Album:             %s\n",TAGS->album);
+
+        else if ( !strcmp("year", tag) )
+            printf("Year:                %s\n",TAGS->year);
+
+        else if ( !strcmp("description", tag))
+            printf("Description:           %s\n",TAGS->description);
+
+        else if ( !strcmp("number_in_album", tag) )
+            printf("Number in album:               %d\n\n",TAGS->number_in_album);
+
+        else if ( !strcmp("null_byte", tag) )
+            printf("null_byte:               %d\n\n",TAGS->null_byte);
+
+        else if ( !strcmp("genre", tag) )
+            printf("Genre:               %d\n\n",TAGS->genre);
+
+        else {
+            printf("Unknown TAG.\n");
+            return 0;
+        }
+    }
+        /* --set= */
+    else if (!strncmp("--set=", argv[2], 6)) {
+        // Название тэга
+        tag = strpbrk(argv[2], "=") + 1;
+        if (!strncmp("--value=", argv[3], 8)) {
+            val = strpbrk(argv[3], "=") + 1;
+            if ( !strcmp(tag, "name") )
+                memcpy(TAGS->name, val, 30);
+
+            else if ( !strcmp(tag, "artist") )
+                memcpy(TAGS->artist, val, 30);
+
+            else if ( !strcmp(tag, "album") )
+                memcpy(TAGS->album, val, 30);
+
+            else if ( !strcmp(tag, "year") )
+                memcpy(TAGS->year, val, 4);
+
+            else if ( !strcmp(tag, "description") )
+                memcpy(TAGS->description, val, 30);
+
+            else if ( !strcmp("number_in_album", tag) )
+                memcpy(TAGS->number_in_album, val, 1);
+
+            else if ( !strcmp("null_byte", tag) )
+                memcpy(TAGS->null_byte, val, 1);
+
+            else if ( !strcmp("genre", tag) )
+                memcpy(TAGS->genre, val, 1);
+
+        }
+        else {
+            printf("Error with command --value=\n");
+            return 0;
+        }
+    }
+
+    else {
+        printf("Unknown command: %s\n", argv[2]);
+        return 0;
+    }
+
+    // Закрытие изначального mp3 файла
+    fclose(Filein);
+
+    if ((Fileout = fopen(mp3_name, "wb+")) == NULL) {
+        printf("Failed to open file %s  for writing.\n", mp3_name);
+        return 0;
+    }
+
+    // В temp2[] будут временно хранится изменённые тэги
+    char* temp2 =(char*) malloc(sizeof(char) * ID3_MAX_SIZE);
+    // Весь массив (все байты) заполняются 0
+    memset(temp2, 0, ID3_MAX_SIZE);
+    // Записываем изменённые тэги
+    temp2 = (char*)TAGS;
+    fseek(Fileout, file_offset(Fileout), SEEK_SET);
+    // Записываем 128 байт из temp2[] 1 раз в Fileout
+    fwrite(temp2, 1, ID3_MAX_SIZE, Fileout);
+    free(temp2);
+    fclose(Fileout);
+
+    return 0;
+}
\ No newline at end of file