using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using System.Xml;

​

public class Program

{

    public static void Main()

    {

        var json = @"{totalDatas : ""1234""}";

        var obj = JObject.Parse(json);

        var token = obj["totalDatas"];

        int result = (int) token;

        Console.WriteLine(result*2);

    }

}