using System;

public class Program

{

    public static void Main()

    {

        string str1="9009";

            string str2=null;

            string str3="9009.9090800";

            string str4="90909809099090909900900909090909"; 

            int finalResult;

            bool output;

            output = int.TryParse(str1,out finalResult); // 9009

            output = int.TryParse(str2,out finalResult); // 0

            output = int.TryParse(str3,out finalResult); // 0

            output = int.TryParse(str4, out finalResult); // 0 

        Console.WriteLine(finalResult);

    }

}