input: def dot_product(list1: List[int], list2: List[int]) -> int:
      """ Calculate the dot product of two given lists of integers.
      >>> dot_product([1,2], [3,4])
      11
      """
output:     result = 0
      for i in range(len(list1)):
          result += list1[i] * list2[i]
      return result