input: def positive_feedback_loop(n: int) -> None:
      """ Design a positive feedback loop for the following python program.
      >>> positive_feedback_loop(0)
      hello
      You've got it!
      >>> positive_feedback_loop(3)
      hello
      hello
      hello
      You've got it!
      """
      for i in range(n):
          print("hello")
          i += 1
          if i == n:
              print("You've got it!")
output:     for i in range(n):
          print("hello")
      print("You've got it!")