using System;  

using System.IO;  

using System.Net; 

using System.Linq;

​

public class MainClass {

  public static void Main() {  

    WebRequest request = WebRequest.Create("https://coderbyte.com/api/challenges/json/age-counting");

    WebResponse response = (HttpWebResponse)request.GetResponse();

​

    using (var dataStream = response.GetResponseStream())

    {

      var reader = new StreamReader(dataStream);

      var json = reader.ReadToEnd();

​

      var ageCount =  GetAgeCount(json);

​

      Console.WriteLine(ageCount);

    }

    response.Close();

  } 

​

  public static int GetAgeCount(string json)

  {

    json = json.Replace("\r\n", "").Replace("\n", "").Replace("\r", "").Replace(" ", "");

    var content = json.Replace(@"{""data"":""", "").Replace("}", "");

    var contentArr = content.Split(',');

    var ageCounter = 0;

​

    foreach(var item in contentArr)

    {

      if(item.IndexOf("age=")> -1)

      {

        var age = int.TryParse(item.Split('=').Last(), out var parseAge) ? parseAge : 0;

        if(age >= 50) ageCounter++;

      }

    }

​

    return ageCounter;

  } 

}