using System;

class Program
{
    static void Main(string[] args)
    {
        int decNum = int.Parse(Console.ReadLine());
        string binNum = string.Empty;
        do
        {
            int bit = decNum % 2;
            binNum = bit + binNum;
            decNum /= 2;
        } while (decNum > 0);
        Console.WriteLine(binNum);
    }
}