import java.util.*;

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