use std::io::{self, *}; fn main() { let stdin = io::stdin(); for line in stdin.lock().lines() { println!("{}", line.unwrap().chars().fold(0, |acc, x| { 16 * acc + match x { '0' => 0, '1' => 1, '2' => 2, '3' => 3, '4' => 4, '5' => 5, '6' => 6, '7' => 7, '8' => 8, ...