#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
//using mint = modint998244353;
int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    ll a,b;
    cin >> a >> b;

    ll x = 1;
    while(1){
        if(x%a == b%x){
            break;
        }
        x++;
    }

    cout << x << '\n';

}