package ProstiPresmqtaniq;

import java.util.Scanner;

public class UsdToBGN {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double USD = Double.parseDouble(scanner.nextLine());
        double BGN = 1.79549;
        double rezult = USD * BGN;
        System.out.printf("%.2f", rezult);
    }
}