input: from typing import List
  
  def calculate_sum(arr: List[int]) -> int:
      """ Calculate the sum of all integers in the given array.
      >>> calculate_sum([1, 3, 5, 7])
      16
      """
      sum = 0
      for i in arr:
          sum += i
      return sum
output:     sum = 0
      for i in arr:
          sum += i
      return sum