#functions go here
def int_check():
    """Checks if users intger input is less or equal to 13."""
    error="please input and integer (whole number) more than/equal to 13. "
    while True:
        try:
            response= int(input('What is the game goal?'))

            if response<=13:
                print(error)
            else:
                return response
        except ValueError:
            print(error)
#main routine starts here
game_goal=int_check()
print(game_goal)