package examPrep;

import java.util.Scanner;

public class P01FruitMarket {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double strawberryPrice = Double.parseDouble(scanner.nextLine());
        double bananasQuantity = Double.parseDouble(scanner.nextLine());
        double orangesQuantity = Double.parseDouble(scanner.nextLine());
        double raspberryQuantity = Double.parseDouble(scanner.nextLine());
        double strawberryQuantity = Double.parseDouble(scanner.nextLine());

        double raspberryPrice = strawberryPrice / 2;
        double orangesPrice = raspberryPrice * 0.6;
        double bananasPrice = raspberryPrice * 0.20;

        double allRaspberries = raspberryPrice * raspberryQuantity;
        double allStrawberries = strawberryPrice * strawberryQuantity;
        double allOranges = orangesPrice * orangesQuantity;
        double allBananas = bananasPrice * bananasQuantity;

        double totalSum = allRaspberries + allStrawberries + allOranges + allBananas;

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