06. Fishland

import java.util.Scanner;

public class Fishland {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double mackerelPrice = Double.parseDouble(scanner.nextLine());
        double spratPrice = Double.parseDouble(scanner.nextLine());
        double bonitoFishKg = Double.parseDouble(scanner.nextLine());
        double saffronKg = Double.parseDouble(scanner.nextLine());
        double shellKg = Double.parseDouble(scanner.nextLine());

        double bonitoFishSum = bonitoFishKg * mackerelPrice * 1.60;
        double saffronSum = saffronKg * spratPrice * 1.80;
        double shellSum = shellKg * 7.50;
        double sum = bonitoFishSum + saffronSum + shellSum;

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