using System;

class Program
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());

        var life = new int[N, 2];

        for(int i = 0; i < N; i++)
        {
            var line = Console.ReadLine().Split(' ');
            for(int j = 0; j < 2; j++)
            {
                life[i, j] = int.Parse(line[j]);
            }
        }
        for(int i = 0; i < N; i++)
        {
            int x = life[i, 1];
            int down = life[i, 0] * life[i, 1];
            Console.WriteLine(x + down);      
        }
    }
}