using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var functions = new List<Func<int,int>>();

        for (int i=1; i<6; ++i)

        {

            functions.Add(n => i*n);

        }

        var result = functions

            .Select((func, index) => func.Invoke(index))

            .Sum();     

        Console.WriteLine(result);

    }

}