#include <bits/stdc++.h>
using namespace std;

#define rep(i, n) for (int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
const int mod = 1000000007;
const long long INF = 1LL << 60;

int main()
{
  int N;
  cin >> N;
  
  rep(i,N){
    int A,B;
    cin >> A >> B;
    cout << (B+A*B) << endl;
  }
}