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