using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int n;

        n = Convert.ToInt32(Console.ReadLine());

        int[] a = new int[n]; 

        for(int i=0;i<n;i++)

        {

            a[i] = Convert.ToInt32(Console.ReadLine());

        }

        Dictionary<int,int> d = new Dictionary<int,int>();

        for(int i=0;i<n;i++)

        {

            if(d.ContainsKey(i))

            {

                d.tr

            }else

            {

                d.Add(i,1);

            }

        }

        Console.WriteLine("Hello World");

    }

}