using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Attribute.Add(new List <int>(){22,56,20,2});

    }

}

public class Attribute

{

    [Obsolete ("use Add(List<int> numbers) method ")]

    public static int Add( int FN, int SN)

    {

        return FN + SN;

    }

    public static int Add(List<int> numbers)

    {

        int Sum = 0;

        foreach(int number in numbers)

        {

            Sum = Sum + number;

        }

        Console.WriteLine(Sum);

        return Sum;

    }

}