#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

void solve() {
    int A, B;
    cin >> A >> B;

    int ans = B * (1 + A);
    cout << ans << "\n";
}

int main() {
    int T;
    cin >> T;
    while (T--)
        solve();

    return 0;
}