#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)

int main(){
    ll a,b;
    cin >> a >> b;
    ll ans = 0;
    if (a == 0){
        ans = b;
    }
    else{
        ll x = b/a;
        ans = a*x + b;
    }
    cout << ans << endl;
    
    return 0;
}