print('Hello world!')

def A(a,b):
    result = a + b
    while a % result != 0 or b % result != 0:
        result -= 1
    return result

print(A(15,16))

def Ä(a,b):
    result = 1
    while result / a != b:
        result += 1
    return result

print(Ä(2,16))