diff --git a/lab3/main.c b/lab3/main.c
new file mode 100644
index 0000000..6282afb
--- /dev/null
+++ b/lab3/main.c
@@ -0,0 +1,115 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+int main()
+{
+
+    struct tm time;
+
+    char *filename = "access_log_Jul95";
+
+    long *line_time;
+
+    char entire_line[4150];
+    int line_count = 0;
+
+    char ref[2049];
+    char time_of_request[27];
+    char data[2049];
+    int result;
+    int data_weight;
+    int ErrorCount = 0;
+    char month[3];
+    char months[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Dec"};
+
+    long long window;
+
+    FILE *foe = fopen(filename, "r");
+
+    if (!foe) {
+
+        printf("%s", "File did not open.");
+
+        return -1;
+    }
+
+    while (fgets(entire_line, 4150, foe) != NULL) line_count++;
+
+    printf("Enter time window\n");
+    scanf("%lld", &window);
+
+    printf("Counting requests with 5xx error (server errors)...\n\n");
+
+    int line = 0;
+
+    line_time = malloc(sizeof(long) * line_count);
+
+    fseek(foe, 0, SEEK_SET);
+
+    while (!feof(foe)) {
+
+        fscanf(foe, "%s - - [%[^]]] \"%[^\"]\" %d %d", ref, time_of_request, data, &result, &data_weight);
+
+        if ((result / 100) == 5) {
+
+            ErrorCount++;
+
+            printf("%d)  %s\n", ErrorCount, data);
+        }
+
+        sscanf(time_of_request,"%d/%3s/%d:%d:%d:%d", &time.tm_mday, month, &time.tm_year, &time.tm_hour, &time.tm_min, &time.tm_sec);
+
+        short cur_month;
+
+        for (cur_month = 0; cur_month < 12; cur_month++) {
+            if (!strcmp(months[cur_month], month)) break;
+        }
+
+        time.tm_mon = cur_month;
+        time.tm_year -= 1900;
+
+        line_time[line] = (long)mktime(&time);
+
+        line++;
+    }
+
+    int difference = 0, current_length = 1, maximum = 0, position = 1, left_bound_final, right_bound_final;
+
+    for (int cur_line = 1; cur_line < line_count; cur_line++) {
+
+        current_length++;
+        difference += line_time[cur_line] - line_time[cur_line - 1];
+
+        while ((difference > window) && (position + 1 < line_count)) {
+            difference -= (line_time[position] - line_time[position - 1]);
+            position++;
+            current_length--;
+        }
+
+        if (current_length > maximum) {
+            maximum = current_length;
+            left_bound_final = position;
+            right_bound_final = cur_line;
+        }
+    }
+
+    struct tm *time_start;
+    struct tm *time_end;
+
+    printf("\nQuantity of requests with 5xx error (server errors): %d\n", ErrorCount);
+
+    time_t left_bound_final_ll = line_time[left_bound_final];
+    time_start = localtime(&left_bound_final_ll);
+
+    printf("\nMaximum quantity of requests in %lld second(s) window: %d\nFrom %s", window, maximum, asctime(time_start));
+
+    time_t right_bound_final_ll = line_time[right_bound_final];
+    time_end = localtime(&right_bound_final_ll);
+
+    printf("  to %s", asctime(time_end));
+
+    fclose(foe);
+    return 0;
+}
\ No newline at end of file