import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNextLine()){
String octStr = sc.nextLine().substring(2);
int oct = Integer.parseInt(octStr,16);
System.out.println(oct);
}
}
}
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNextLine()){
String octStr = sc.nextLine().substring(2);
int oct = Integer.parseInt(octStr,16);
System.out.println(oct);
}
}
}