Python_program Using def function

[GGomez]

I have to write a python program that get a keyboad number and verfiy using the def function. Help

        n = int(input("Write a number")
def countdown(n):
   if n >= 0:
    print('Blast off! Zero down') 
else:
    print(n)
    countup(n+1)
    countdown(3)