def fizzbuzz(n):
    for i in range(1, n + 1):
        if i % 3 == 0 and i % 5 == 0:
            print('FizzBuzz')
        elif i % 3 == 0:
            print('Fizz')
        elif i % 5 == 0:
            print('Buzz')
        else:
            print(i)

def gcf(i1, i2):
    gcf = None
    if i1 > i2:
        smaller = i2
    else:
        smaller = i1
    for i in range(1, smaller + 1):
        if i1 % i == 0 and i2 % i == 0:
            gcf = i
    return gcf
        
gcf(20, 12)

def gcf(x, y): 
    if y == 0:
        x, y = y, x   
    while y != 0:
        x, y = y, x % y
    return x

def is_prime(n):
    for i in range(2, n):
        if n % i == 0:
            return False
    return True