#include <bits/stdc++.h>

using namespace std;
#define rep(i, n, o) for(int i = o;i < (n);i++)
#define ou(x) cout << x << endl
#define ll long long
#define re return 0

int main(){
    int t;
    cin >> t;
    vector<int> a(t);
    vector<int> b(t);
    int cnt = 0;
    rep(i, t, 0) {
        cin >> a[i] >> b[i];
    }
    rep(i, t, 0){
        cnt = b[i];
        cnt += (a[i] * b[i]);
        ou(cnt);
        cnt = 0;
    }
    re;
}