using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        int[] tn = new int[2];

        tn[0] = 12;

        tn[1] = 30;

        Add(10,20);

        Add(10,20,56,78,99,13);

        Add(10, 20, tn);

    }

    public static void Add(int fn, int sn)

    {

        int sum = fn + sn;

        Console.WriteLine(sum);

        Console.WriteLine();

    }

​

    public static void Add(int fn, int sn, params int[] tn)

    {

        int sum = fn + sn;

        Console.WriteLine(sum);

        Console.WriteLine("Tn sum: {0}", tn.Sum());

        Console.WriteLine();

    }

}