#include <iostream>
#include <utility>
using namespace std;

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

int main() {
    long A, B;
    cin >> A >> B;
    cout << gcd(A + B, (__int128)A * B);
}