import java.util.Scanner;

public class BinaryToDecimal 
{

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Scanner keyboard = new Scanner(System.in);
		int sum = 0;

		// Ask for input from user
		System.out.println("Please enter 4 binary digits, separated by spaces:");
		
		// Get first digit & add to sum
		sum = sum + 8 * keyboard.nextInt();
		
		// Get second digit
		sum = sum + 4 * keyboard.nextInt();
		
		// Get third
		sum += 2 * keyboard.nextInt();
		
		// Get fourth 
		sum += keyboard.nextInt();
		
		// Report the result
		System.out.println("The decimal equivalent is: " + sum);
	}

}