diff --git "a/\320\233\320\260\320\261\320\276\321\200\320\260\321\202\320\276\321\200\320\275\320\260\321\217 \321\200\320\260\320\261\320\276\321\202\320\260 4/task_1.py" "b/\320\233\320\260\320\261\320\276\321\200\320\260\321\202\320\276\321\200\320\275\320\260\321\217 \321\200\320\260\320\261\320\276\321\202\320\260 4/task_1.py"
new file mode 100644
index 0000000..149536a
--- /dev/null
+++ "b/\320\233\320\260\320\261\320\276\321\200\320\260\321\202\320\276\321\200\320\275\320\260\321\217 \321\200\320\260\320\261\320\276\321\202\320\260 4/task_1.py"	
@@ -0,0 +1,17 @@
+import json
+
+INPUT_FILE = "input.json"
+
+
+def task() -> float:
+    """
+    Функция для подсчета суммы произведений двух значений в каждом словаре из JSON файла.
+    """
+    with open(INPUT_FILE, "r", encoding="utf-8") as input_file:
+        json_data = json.load(input_file)
+
+    sum_data = sum([item["score"] * item["weight"] for item in json_data])
+    return round(sum_data, 3)
+
+
+print(task())
diff --git "a/\320\233\320\260\320\261\320\276\321\200\320\260\321\202\320\276\321\200\320\275\320\260\321\217 \321\200\320\260\320\261\320\276\321\202\320\260 4/task_2.py" "b/\320\233\320\260\320\261\320\276\321\200\320\260\321\202\320\276\321\200\320\275\320\260\321\217 \321\200\320\260\320\261\320\276\321\202\320\260 4/task_2.py"
new file mode 100644
index 0000000..9d46bb5
--- /dev/null
+++ "b/\320\233\320\260\320\261\320\276\321\200\320\260\321\202\320\276\321\200\320\275\320\260\321\217 \321\200\320\260\320\261\320\276\321\202\320\260 4/task_2.py"	
@@ -0,0 +1,27 @@
+import json
+import csv
+
+INPUT_FILENAME = "input.csv"
+OUTPUT_FILENAME = "output.json"
+
+
+def task() -> None:
+    """
+    Конвертер из CSV в JSON формат
+
+    Функция считывающая данные из CSV-файла, преобразуя их в список словарей и сохраняя данные в файле JSON.
+    """
+    with open(INPUT_FILENAME, "r", encoding="utf-8") as input_file:
+        reader = csv.DictReader(input_file, delimiter=",", quotechar="\n")
+        list_data = [row for row in reader]
+
+    with open(OUTPUT_FILENAME, "w", encoding="utf-8") as output_file:
+        json.dump(list_data, output_file, indent=4)
+
+
+if __name__ == '__main__':
+    task()
+
+    with open(OUTPUT_FILENAME) as output_f:
+        for line in output_f:
+            print(line, end="")