using System;
using System.Collections.Generic;
using System.Linq;

namespace No285
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			var n = Convert.ToInt64(Console.ReadLine ());

			var n100 = n * 108L;

			var div = n100 / 100L;
			var mod = n100 % 100L;
			if (mod == 0) {
				Console.WriteLine (div.ToString ());
				return;
			}
			if (mod / 10 == 0) {
				string result = div.ToString () + "." + mod.ToString ("D2");
				Console.WriteLine (result.ToString ());
				return;
			} else if(mod % 10 == 0){
				string result = div.ToString () + "." + (mod/10L).ToString ("D1");
				Console.WriteLine (result.ToString ());
				return;
			}
			else {
				string result = div.ToString () + "." + mod.ToString ();
				Console.WriteLine (result.ToString ());
				return;
			}
		}
	}
}