input: 
  def calculate_total_sum(data: List[int]) -> int:
      """
      Calculate the total sum of all elements in the given list.
      >>> calculate_total_sum([1, 9, 3, 5])
      18
      >>> calculate_total_sum([10, 20, 30])
      60
      """
  
output:     total = 0
      for num in data:
          total += num
      return total