using System;

class Program
{
    static void Main(string[] args)
    {
        string S = Console.ReadLine();
        double T = 0;
        if (S[0] == 'x') T = Math.Pow(2, 32) - int.Parse(S.Substring(1));
        else T = int.Parse(S);
        Console.WriteLine(T);
    }
}