A, B = [int(x) for x in input().split(' ')]

def cal(a, b):
    if b > a:
        a, b = b, a
    
    def gcd(x, y):
        if y == 0:
            return x
        else:
            return gcd(y, x % y)
    
    print(gcd(a, b))

cal(A + B, A * B)