02_DecimaToBinary

using System;

namespace _02_DecimaToBinary
{
    public class Program
    {
        public static void Main()
        {
                string input;

                while ((input = Console.ReadLine()) != "END")
                {
                    int decimalNumber = int.Parse(input);

                    string binary = string.Empty;

                    while (decimalNumber > 0)
                    {
                        binary += decimalNumber % 2;
                        decimalNumber = decimalNumber / 2;
                    }

                    for (int i = 0; i < binary.Length; i++)
                    {
                        Console.Write(binary[binary.Length - i - 1]);
                    }
                    Console.WriteLine();
                }
        }
    }
}