// 

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.charAt(0) == 'x') System.out.println((1L<<32)-Integer.parseInt(s.substring(1)));
        else System.out.println(Integer.parseInt(s));
        sc.close();
    }
}