Add a_very_big_sum algorithm to maths folder

maths/special_numbers/a_very_big_sum.py

@@ -0,0 +1,27 @@
+<<<<<<< HEAD
+def a_very_big_sum(arr: list[int]) -> int:
+=======
+from typing import List
+
+
+def a_very_big_sum(arr: List[int]) -> int:
+>>>>>>> 2e5b8980304014f131c23d43a7a08e624c23de8b
+    """
+    Return the sum of all integers in the input array.
+
+    >>> a_very_big_sum([2, 4, 6])
+    12
+    >>> a_very_big_sum([])
+    0
+    """
+    total = 0
+    for i in arr:
+        total += i
+    return total
+
+if __name__ == "__main__":
+    # Example usage
+    arr = [2, 4, 6, 2, 4, 6, 3]
+    result = a_very_big_sum(arr)
+    print(f"Sum of {arr} is {result}")
+