import java.util.*;



public class BinaryConverter
{

	public static Scanner kb = new Scanner(System.in);

	public static String binary;
	public static int decimal=0;

	public static void main(String args[])
	{
		System.out.println("Hi, I'm Binarybot!  Please enter a binary number of 10 digits or less so I can convert it into decimal!");
		getInput();
		doMath();
	}

	public static void getInput()
	{
		binary = kb.next();
		if (binary.length() > 10){
			System.out.println("Sorry, I'm not programmed to handle that many!  Please enter less digits,");
			getInput();
		}
		else if (!(binary.contains("1") || binary.contains("0"))){
			System.out.println("Binary numbers only contain 0 or 1, try again!");
			getInput();
		}
		else {System.out.println("Okay, " + binary + "...");}

	}

	public static void doMath()
	{
		int length=1;
		char check=0;
		length=binary.length();

		for (int i=0; i<length; i++){
			check = binary.charAt(i);


				if(check == '1')
				{
					decimal=decimal+(2^(length-i));
					System.out.println(decimal);
				}

		}
	}
}