xkcd c#

using System;
using System.Web;
using System.Net.Http;
using System.Text.RegularExpressions;
using Newtonsoft.Json.Linq;

namespace ConsoleApp1 {
    class Program {
        static Regex rXKCDAddress = new Regex(@"https://xkcd\.com/\d+", RegexOptions.Compiled);
        static Random r = new Random();
        static HttpClient c = new HttpClient();
        static int l = JObject.Parse(c.GetStringAsync("https://xkcd.com/info.0.json").Result).GetValue("num").Value<int>();

        static void Main() {
            while (true)
                Console.WriteLine(XKCD(Console.ReadLine()));
        }

        static string XKCD(string s) {
            if (int.TryParse(s, out int n) && n <= l)
                return "https://xkcd.com/" + n;
            if (string.IsNullOrWhiteSpace(s))
                return "https://xkcd.com/" + r.Next(1, l + 1);
            return rXKCDAddress.Match(c.GetStringAsync("https://www.google.com/search?source=hp&q=site%3Axkcd.com+-site%3Aforums.xkcd.com+-site%3Ablog.xkcd.com+-site%3Afora.xkcd.com+" + HttpUtility.HtmlEncode(s.Replace(' ', '+'))).Result).Value;
        }
    }
}