using System;

public class Program

{

    public static void Main()

    {

        A.Add(11, 10, new int[]{10,20});

    }

}

public class A

{

    public static void Add(int FN , int SN , int [] restOfNumbers = null )

    {

        int Sum = FN + SN;

        if (restOfNumbers != null)

        {

            foreach(int i in restOfNumbers)

            {

                Sum += i;

            }

        }

        Console.WriteLine("Sum = {0}", Sum);        

    }

}