#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
int main() {
    // Input And Output
    int T;
    cin >> T;
    rep(i, T) {
        int A, B;
        cin >> A >> B;
        cout << (A + 1) * B << endl;
    }
}