B-day Party

import java.util.Scanner;

public class BirthdayParty {
    public static void main(String[] args) {
        Scanner scan = new Scanner (System.in);
        int rent = Integer.parseInt (scan.nextLine ());
        double cake = rent * (20.0/100);
        double drinks = cake - (cake * (45.0/100));
        double animator = rent/3.0;
        double budget = rent + cake + drinks + animator;
        System.out.println (budget);



    }
}