#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int main(){
    int n, a, b;
    cin >> n;
    for (int i = 0; i < n; i++){
        cin >> a >> b;
        cout << a * b + b << endl;
    }
}