using System;

using System.Web;

using System.Net.Http;

public class Program

{

    public static void Main()

    {

        var h = new HttpClient();

        h.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0;(Windows NT 10.0; Win64; x64);AppleWebKit/537.36;(KHTML, like Gecko);Chrome/77.0.3865.90;Safari/537.36");

        Console.WriteLine("Hello World");

    }

}