/**
 * @(#)Text1.java
 *
 *
 * @author
 * @version 1.00 2011/10/11
 */


import java.util.Scanner;

public class Text1 {

    public static void main (String[] args) {

    	Scanner input = new Scanner(System.in);

    	int enteredBinary;
    	System.out.print("Enter your four digit binary number: ");
    	enteredBinary = input.nextInt();

    	int count = 1;
    	int updatedBinary = 0;
    	int firstDigit = 0;
    	int secondDigit = 0;
    	int thirdDigit = 0;
    	int fourthDigit = 0;

    	int yourTotal = 0;

    	while ( count <= 4 ) {

    		if (count == 1) {
    			firstDigit = enteredBinary % 10;
    			updatedBinary = enteredBinary / 10;

    		}

    		if (count == 2) {
    			secondDigit = updatedBinary % 10;
    			updatedBinary = updatedBinary / 10;
    		}

    		if (count == 3) {
    			thirdDigit = updatedBinary % 10;
    			updatedBinary = updatedBinary / 10;
    		}

    		if (count == 4) {
    			fourthDigit = updatedBinary % 10;
    		}

			count ++;
    	}

    	yourTotal = (fourthDigit * 8)+ (thirdDigit * 4) + (secondDigit *2)+ (firstDigit * 1);
    	System.out.println("Your binary conversion is: " + yourTotal);


    }


}