Fish Land

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double mackerelPrice = Double.parseDouble(scanner.nextLine()),
                spratPrice = Double.parseDouble(scanner.nextLine()),
                bonitoFishKg = Double.parseDouble(scanner.nextLine()),
                saffronKg = Double.parseDouble(scanner.nextLine()),
                shellKg = Double.parseDouble(scanner.nextLine()),
                bonitoFishSum = bonitoFishKg * mackerelPrice * 1.60,
                saffronSum = saffronKg * spratPrice * 1.80,
                shellSum = shellKg * 7.50;

        System.out.printf("%.2f\n", bonitoFishSum + saffronSum + shellSum);
    }
}