using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        string valor_converter = "9813959,6399";

        decimal convertido = 0;

        Decimal.TryParse(valor_converter.Trim(), NumberStyles.Currency, new CultureInfo("pt-br"), out convertido);

        Console.WriteLine(convertido);

    }

}