#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

int main() {
	ll a, b;
	cin >> a >> b;
	__int128 w = a + b;
	__int128 ab = a;
	ab *= b;
	ll g = __gcd(w, ab);
	cout << g<< endl;
}