import java.util.Scanner;

public class Bin2Dec {

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);
        System.out.print("Please enter a binary number: ");
        int n1 = in.nextInt();
        int n2 = n1;
        in.close();

        int value1 = 0;
        int count = 0;
        while (n1 != 0) {
            int lastDigit = n1 % 2;
            value1 += lastDigit * Math.pow(2, count);
            n1 /= 10;
            ++count;
        }
        System.out.println(value1);

        // Alternative approach: instead of using Math.pow(), use a weight
        // variable that doubles after each iteration

        int value2 = 0;
        int weight = 1;
        while (n2 != 0) {
            int lastDigit = n2 % 2;
            value2 += lastDigit * weight;
            n2 /= 10;
            weight *= 2;
        }
        System.out.println(value2);
    }

}