import java.net.SocketOption;
import java.util.Scanner;

        import static java.lang.Math.PI;

public class Demo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int days = Integer.parseInt(scanner.nextLine());
        int bakers = Integer.parseInt(scanner.nextLine());
        int cakes = Integer.parseInt(scanner.nextLine());
        int goffrets = Integer.parseInt(scanner.nextLine());
        int pancakes = Integer.parseInt(scanner.nextLine());



        double cakesProfit = 45 * cakes;
        double goffretsProfit = 5.80 * goffrets;
        double pancakesProfit = 3.20 * pancakes;
        double sumPerDay = (cakesProfit +  goffretsProfit + pancakesProfit);
        double totalSum = sumPerDay * days;
        double expenses = totalSum * 1/8;
        double finalSum = totalSum  - expenses;

        System.out.printf("%.2f", finalSum);



    }
}