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