diff --git a/km73/Hnidak_Maryna/12/task3.py b/km73/Hnidak_Maryna/12/task3.py
new file mode 100644
index 00000000..dd4d4990
--- /dev/null
+++ b/km73/Hnidak_Maryna/12/task3.py
@@ -0,0 +1,29 @@
+def groups(list, iterator):
+    """
+    This function is the largest group
+    Args:
+        list: list, input parameter
+        iterator: integer, index
+    Returns:
+        max(a): integer, result of the program
+    Raises:
+        ValueError, OverflowError, ZeroDivisionError
+    Examples:
+        >>> print([1,1,1,2,2,1,3,3,3,4,],0)
+        "3"
+    :param list:
+    :param iterator:
+    :return:
+    """
+    if iterator == len(list):
+        return max(a)
+    list_two = "".join(list)
+    count_of_element = list.count(list[iterator])
+    if (count_of_element - iterator)*str(list[iterator]) in list:
+        a.append(count_of_element - iterator)
+    return groups(list, iterator + 1)
+
+
+a = []
+list = input("Enter list : ").split()
+print(groups(list, 0))