FishBazzar

import java.util.Scanner;

public class FishBazar {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double pricePerKiloForSkumriq = Double.parseDouble(scanner.nextLine());
        double pricePerKiloForCaca = Double.parseDouble(scanner.nextLine());
        double kilogramsOfPalamud = Double.parseDouble(scanner.nextLine());
        double kilogramsOfSafrid = Double.parseDouble(scanner.nextLine());
        int kilogramsOfMidi = Integer.parseInt(scanner.nextLine());
        if (0 < pricePerKiloForSkumriq && pricePerKiloForSkumriq <= 40)
            if (0 < pricePerKiloForCaca && pricePerKiloForCaca <= 30)
                if (0 < kilogramsOfPalamud && kilogramsOfPalamud <= 50)
                    if (0 < kilogramsOfSafrid && kilogramsOfSafrid <= 70)
                        if (0 <= kilogramsOfMidi && kilogramsOfMidi <= 100) {
                            double totalAmountOfSum = (kilogramsOfPalamud * 1.6 * pricePerKiloForSkumriq + kilogramsOfSafrid * 1.8 * pricePerKiloForCaca + kilogramsOfMidi * 7.5);
                            System.out.printf("%.2f", totalAmountOfSum);
                        }

    }
}