import sys
sys.setrecursionlimit(10000000)
MOD = 10 ** 9 + 7
INF = 10 ** 15

from math import gcd
def main():
    A,B = map(int,input().split())
    ans = gcd(A + B,A*B)
    print(ans)  
if __name__ == '__main__':
    main()