using System;

public static class Ex

{

    public static (int, int) Add(this (int, int) t1, (int, int) t2) =>  (t1.Item1+t2.Item1, t1.Item2+t2.Item2);

}

public class Program

{   

    public static void Main()

    {

        var Tuple1 = (x:2,y:4);

        var Tuple2 = (x:0,y:-1);

        var Tuple3 = Tuple1.Add(Tuple2);

        Console.WriteLine($"({Tuple3.Item1}, {Tuple3.Item2})");

    }

}