input: def double_add(num1: int, num2: int) -> int:
      """
      Given two integers, add them and then double the result.
      
      >>> double_add(2, 3)
      10
      >>> double_add(5, 5)
      20
      """
      return (num1 + num2) * 2
output:     return (num1 + num2) * 2