#include <stdio.h>

long gcd(__int128 x, __int128 y)
{
    __int128 r;
    if (y > x) {
        r = x;
        x = y;
        y = r;
    }
    while (y > 0) {
        r = x % y;
        x = y;
        y = r;
    }
    return x;
}

int main(void)
{
    long A, B;
    scanf("%ld%ld", &A, &B);
    printf("%ld", gcd(A + B, (__int128)A * B));
    puts("");
    return 0;
}