#include <iostream>
#include <vector>
using namespace std;

int main(void) {
  int t;
  cin >> t;
  vector<int> days(t);
  for (int i = 0; i < t; i++) {
    int a, b;
    cin >> a >> b;
    days[i] = b + a * b;
  }

  for (int i = 0; i < days.size(); i++) {
    cout << days[i] << endl;
  }
  return 0;
}