手算

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw = new PrintWriter(System.out);

        String str = br.readLine();
        int ans = 0;
        for (int i = 2; i < str.length(); i++) {
            char c = str.charAt(i);
            int t = Character.isDigit(c) ? c - '0' : c - 'A' + 10;
            ans = ans * 16 + t;
        }
        pw.println(ans);

        pw.flush();
        pw.close();
        br.close();
    }
}