Pool Day

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int people = Integer.parseInt(scanner.nextLine());
        double entrancePrice = Double.parseDouble(scanner.nextLine()),
                deskChairPrice = Double.parseDouble(scanner.nextLine()),
                umbrellaPrice = Double.parseDouble(scanner.nextLine()),
                total = entrancePrice * people
                        + deskChairPrice * Math.ceil(0.75 * people)
                        + umbrellaPrice * Math.ceil(0.5 * people);

        System.out.printf("%.2f lv.\n", total);
    }
}