using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> numbers = new List<int>{1,2,3,4,5};

        int num = numbers.Count;

        int joined;

        int sumed ;

        for (int i = 0 ; i <= numbers.Count; i++)

        {

            if ( i == num )

                break;

            else

            {

            joined = i;

            sumed = joined + num;

            num = num - 1;

            Console.WriteLine(sumed);

            }

        }

    }

}

​

​