import java.util.Scanner;
/**
* HJ5 进制转换
*/
public class HJ005 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (sc.hasNextLine()) {
String s = sc.nextLine();
String s1 = s.substring(2);
int a = Integer.parseInt(s1, 16);
System.out.println(a);
}
sc.close();
}
}