Reversed Binary Numbers (Difficulty Level: Easy)

My friend sent me a quiz how to make a reverse binary from input number and put it back as number.
It is easy level though, I had fun of it
If you are interested to get more quiz, please check this https://code.google.com/codejam/
There are many programing quiz in Internet. I see there are so many genius in the world.
I wonder when I can resolve the difficult level of quiz. I must study math again.

Task

Your task will be to write a program for reversing numbers in binary. For instance, the binary representation of 13 is 1101, and reversing it gives 1011, which corresponds to number 11.

Input

The input contains a single line with an integer N, 1 ≤ N ≤ 1000000000.

Output

Output one line with one integer, the number we get by reversing the binary representation of N.

Sample input 1
13
Sample output 1
11
Sample input 2
47
Sample output 2
61

package puzzle;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 *
 * @author jack
 */
public class Reversebinary {

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {

        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            String input;

            while ((input = br.readLine()) != null) {
                int inputValue = Integer.parseInt(input);

//                System.out.println(Integer.toBinaryString(inputValue));

                StringBuffer revertedString = new StringBuffer();
                revertedString.append(Integer.toBinaryString(inputValue)).reverse();

//                System.out.println(revertedString);
                System.out.println(Long.parseLong(revertedString.toString(), 2));

            }

        } catch (java.lang.NumberFormatException ne) {
            System.out.println("Please type numbers");
        } catch (IOException io) {
            io.printStackTrace();

        }
    }
}