using System;

using System.Diagnostics;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        StringBuilder result=new StringBuilder();

        Stopwatch st = new Stopwatch();

        st.Start();

        for(int i=0; i<5000; i++)

        {

            result.Append(Convert.ToString(i,2) + "\n");

        }

        st.Stop();

        Console.WriteLine(st.Elapsed);

    }

}