using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(bin2dec(55)); 

    }

    public static string bin2dec(int number)

    {

        if (number == 0) return "0";

        var digits = (int) Math.Floor(Math.Log(number, 2)) + 1;

        var remainder = number;

        var bin = Enumerable.Repeat<int>(0,digits).ToArray();

        while (remainder > 0)

        {

            var power = (int)Math.Floor(Math.Log(remainder, 2));

            remainder = remainder - (int)Math.Pow(2,power);

            bin[digits - power - 1] = 1;

        }

        return String.Join("",bin);

    }

}