#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using uns= unsigned long long;
#define rep(i,a,b) for(ll i = (a); i < (b); i++)

int main() {
    int A,B;
    cin>>A>>B;
    rep(i,1,100000){
        if(i%A==B%i){
            cout<<i<<endl;
            break;
        }

    }


}