using System;

public class Program

{

    public static void Main()

    {

        int dec = int.Parse(Console.ReadLine());

        int a;

        string binary = "";

        if (dec == 0)

        {

            Console.WriteLine(dec);

        }

        else

        {

        while (dec > 0)

        {

            a = dec % 2;

            dec = dec / 2;

            binary = a.ToString() + binary;

        }

            Console.WriteLine(binary);

        }

    }

}