#include <sstream>
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
    unsigned long long a, b;
    cin >> a >> b;
    __int128 sum = ((__int128)a) + ((__int128)b);
    __int128 mul = ((__int128)a) * ((__int128)b);
    unsigned long long gcd = (unsigned long long)__gcd(sum, mul);
    cout << gcd << endl;
    return 0;
}