dec to bin modified

using System;


class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        string bin = "";
        string tempstring = "";
        int counter = 0;

        while (n > 0)
        {
            tempstring += n % 2 + "";
            n /= 2;
            if (n == 1)
            {
                tempstring += '1';
                break;
            }

        }
        //reversing the string
        for (int i = tempstring.Length - 1; i >= 0; i--)
        {
            if (counter % 4 ==0 && counter!=0)
            {
                bin += " ";
            }
            bin += tempstring[i];
            counter++;

        }
        Console.WriteLine(bin);

    }
}