import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
    public static String findBinary(int num, String result) {
        if(num == 0)
            return result;
        
        result = num % 2 + result;
        return findBinary(num / 2, result);
    } 
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(findBinary(12, ""));

	}
}