import java.io.*;

/*
 *
 *	@author David Alvarez Lopez
 *	@email  sly.dekar@gmail.com
 *	@date	18-Oct-05
 *
 */

public class SkewBinary {
	
	private static PrintWriter stdOut = new PrintWriter(System.out,true);
	private static PrintWriter stdErr = new PrintWriter(System.out,true);
	//private static BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
	
	
	public static void main(String[] args) throws IOException {
	
		BufferedReader fileIn = new BufferedReader(new FileReader("C:/input.txt"));
	
		while (fileIn.ready()) {
	
			String s = fileIn.readLine();
			
			if (!s.equals("0")) {
					
				int arr[] = new int[s.length()];
				double num = 0;
					
				for (int i = 0; i<s.length(); i++) {
					
					arr[i] = s.charAt(i) - 48;
					num += (( Math.pow(2,arr.length-i)) - 1) * arr[i];
					//stdOut.println(arr[i]+" x (2^"+(arr.length-i)+" - 1) = "+(((int) Math.pow(2,arr.length-i)) - 1) * arr[i]);
					
					//stdIn.readLine();
				}
				
				stdOut.println((int) num+"");
			}
			else {
				
				System.exit(1);
			}
		}
	}
}