using System;

public class Program

{

    public static int N(int sit,bool[] show)

    {

        if (show[sit]==true)

        {

            show[sit]=false;

            return sit;

        }

        else

        {

            int i=1;

            while (show[sit+i]==false

            {

                if(

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}