def WashClothes():
    print("Clothes are washing.")
    s = input("Is it clean? (y/n) ")
    if s == 'n':
        WashClothes()
        
def AnnoyingSibling():
    """ Repeatedly askl the question why"""
    answer = input("Why? ")
    if answer == 'I quit':
        return
    else:
        AnnoyingSibling()
        
def AskAQ():
    s = input("Why did you enroll in CS 101")
    AnnoyingSibling()
    
def Factorial(n):
    """ Factorial(n) = n! """
    if n == 0:
        return 1
    else:
        return n * Factorial(n-1)

def FibNum(n):
    """ This returns the nth Fib number in the sequence"""
    if n== 0:
        return 1
    elif n==1:
        return 1
    else:
        return FibNum(n-1) + FibNum(n-2)
    
def CompSq(n):
    if n == 0:
        return 0
    else:
        return CompSq(n-1) + (n-1) + n