using static System.Console;

public class Program

{

    static void Main()

    {

        WriteLine($"666 in binary: {bin(666)}");

    }

    static object bin(int a)

    {

        var b="";

        while (a>0)

        {

            b=a%2+b;

            a/=2;

        }

        return b;

    }

}