using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        var cnt = int.Parse(Console.ReadLine());
        for (int i = 0; i < cnt; i++)
        {
            var x = Console.ReadLine().Split().Select(int.Parse).ToArray();
            Console.WriteLine(x[1] + (x[0] * x[1]));
        }
    }
}