using System;

using System.Runtime.InteropServices;

public class Program

{

    public static void Main()

    {

        Test(args2: "shit", args1: "hmm");

        Test(args2: "shit", args3: "hmm");

​

        Console.ReadLine();

    }

​

    static void Test([Optional] string args1, [Optional] string args2, [Optional] string args3)

    {

        Console.WriteLine(args1);

        Console.WriteLine(args2);

        Console.WriteLine(args3);

    }

}