class Program
{
    static void Main(string[] args)
    {
        int total = int.Parse(Console.ReadLine()!);
        List<int> ansList = new List<int>();
        
        for (int i = 0; i < total; i++)
        {
            string[] input = Console.ReadLine()!.Split(' ');
            int increase = int.Parse(input[0]);
            int days = int.Parse(input[1]);

            ansList.Add(increase * days + days);
        }

        for (int i = 0;i < ansList.Count;i++)
        {
            Console.WriteLine(ansList[i]);
        }
    }
}