# -*- coding: utf-8 -*-
"""
No.442 和と積
https://yukicoder.me/problems/no/442

"""
import sys
from sys import stdin
from math import gcd
input = stdin.readline


def main(args):
    A, B = map(int, input().split())
    ans = gcd(A + B, A * B)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])