input: def calculate_factorial(num: int) -> int:
      """ Compute the factorial of a given integer.
      >>> calculate_factorial(7)
      5040
      >>> calculate_factorial(5)
      120
      """
      if num <= 1:
          return 1
      else:
          return num * calculate_factorial(num - 1)
output:     if num <= 1:
          return 1
      else:
          return num * calculate_factorial(num - 1)