intToBase

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            var number = int.Parse(Console.ReadLine());
            string str = Convert.ToString(number, 2).ToUpper();
            Console.WriteLine(str);
        }
    }
}