import java.io.*; import java.util.*; public class Main{ public static void main(String[] args){ Scanner sc = new Scanner(System.in); while(sc.hasNext()){ String str = sc.nextLine(); str=str.substring(2); int res=0; for(int i = str.length()-1;i>=0;i--){ char c = str.charAt(i); if(c>='0' && c<='9'){ res *= 16; res += c-'0'; }else if(c>='A'&&c<='F'){ res *= 16; res += c-'A'+10; }else if(c>='a' && c<='f'){ res *= 16; res += c-'a'+10; }else{ System.out.println(res); } } System.out.println(res); } } }