using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        String str= "00000000";//"  0000000000012345678";

        int _returnVal;

        string matchStr=String.Empty;

        Regex regex = new Regex(@"^[\s]*[-|\\+]?(0)*[1-9]*\d+");

        Match match = regex.Match(str);

        matchStr = match.Value;

        if (!string.IsNullOrEmpty(matchStr))

        {           

            Int32.TryParse(matchStr,out _returnVal);

            if(_returnVal == 0) _returnVal = (matchStr.Contains("-") || matchStr.Contains("+"))? Int32.MinValue : Int32.MaxValue; 

        }

        else

        {

            _returnVal = 0;

        }

        Console.WriteLine(_returnVal);

    }

}