using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        //Regex reg = new Regex(@"^(-)?\d+(\.\d\d)?$");

        //Console.WriteLine(!reg.IsMatch("598.97"));

        //Regex reg = new Regex(@"^(-)?\d+(\.\d\d)?$");

        //Console.WriteLine(!reg.IsMatch("598.97"));

        //Console.WriteLine(!Regex.IsMatch("598.97", @"^\d+(\.\d\d)?$"));

        Regex reg = new Regex(@"^\d+(\.\d\d)?$");

        Console.WriteLine(reg.IsMatch("598.97"));

    }

}