Excursion

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()),
                nights = Integer.parseInt(scanner.nextLine()),
                cards = Integer.parseInt(scanner.nextLine()),
                tickets = Integer.parseInt(scanner.nextLine());

        double total = (20.00 * nights + 1.60 * cards + 6.00 * tickets) * people * 1.25;

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