using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<int> lista = new List<int>()

        {5, 10, 15, 20, };

        int totala = lista.Sum();

        Console.WriteLine("Zerrendako zenbakien batura " + totala + " da");

    }

}