using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<(int, int)> myPairs = [(1, 2), (3, 4)];

        //List<int> justTheYs = myPairs.Select(p => p.Item2).ToList(); // [2, 4]

        int sumOfYs = myPairs.Sum(p => p.Item2);

        Console.WriteLine(sumOfYs);

    }

}