input: from typing import List
  
  
  def calculate_sum(numbers: List[int]) -> int:
      """ Calculate the sum of a list of integers.
      >>> calculate_sum([1, 2, 3, 4, 5])
      15
      >>> calculate_sum([10, 20, 30])
      60
      """
      return sum(numbers)
output:     total = 0
      for num in numbers:
          total += num
      return total