using System;

public class Program

{

    public static void Main()

    {

        int x,l=1,m=0,f,num=0;

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

​

        while(num<1)

        {

            f=x%2;

            m=m+f*l;

            l=l*10;

            x=x/2;

          if(x==0)

            num++;

        }

        Console.WriteLine(m);

    }

}