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