package no285;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = String.valueOf(sc.nextLong() * 108);
		System.out.println(s.substring(0, s.length() - 2) + "." + s.substring(s.length()-2, s.length()));
	}

}