using System.Numerics;

public class Program
{
    public static void Main()
    {

        int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        int[] ints = new int[num];
        for (int i = 0; i < num; i++)
        {
            string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
            int a = int.Parse(str[0]);
            int b = int.Parse(str[1]);

            ints[i] = (a * b) + b;

        }
        foreach (int i in ints)
        {
            Console.WriteLine(i);
        }


    }
}