package com.company;


import java.util.Scanner;

public class Main
{
    public static final Double SHOE_RATIO = 0.6;
    public static final Double EQUIP_RATIO = 0.8;
    public static final Double BALL_RATIO = 0.25;
    public static final Double ACCESSORIES_RATIO = 0.2;

    public static final Double CHICKEN_PRICE = 10.35;
    public static final Double FISH_PRICE = 12.40;
    public static final Double VEGGIE_PRICE = 8.15;
    public static final Double DELIVERY_PRICE = 2.50;

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
//        int chicken = Integer.parseInt(scanner.nextLine());
//        int fish = Integer.parseInt(scanner.nextLine());
//        int veggie = Integer.parseInt(scanner.nextLine());
//
//        System.out.println( createMenu(chicken,fish,veggie));

//        int yearlyTax = Integer.parseInt(scanner.nextLine());
//
//        System.out.println(calculateGear(yearlyTax));

        int length = Integer.parseInt(scanner.nextLine());
        int width = Integer.parseInt(scanner.nextLine());
        int height = Integer.parseInt(scanner.nextLine());
        double pct = Double.parseDouble(scanner.nextLine());

        System.out.println(calculateWater(length, width, height, pct));






    }

    private static Double calculateWater (int length, int width, int height, double pct){
        double volumeAquarium = length * width * height;
        double volumeLitres = volumeAquarium * 0.001;

        return volumeLitres - (volumeLitres * (pct / 100));
    }

    private static Double calculateGear(int yearlyTax) {
        double shoePrice = yearlyTax * SHOE_RATIO;
        double equipPrice = shoePrice * EQUIP_RATIO;
        double ballPrice = equipPrice * BALL_RATIO;
        double accessoriesPrice = ballPrice * ACCESSORIES_RATIO;

        return shoePrice + equipPrice + ballPrice + accessoriesPrice + yearlyTax;
    }

    private static Double createMenu(int chickenCount, int fishCount, int veggieCount){
        double chickenCost = chickenCount * CHICKEN_PRICE;
        double fishCost = fishCount * FISH_PRICE;
        double veggieCost = veggieCount * VEGGIE_PRICE;

        double totalCost = chickenCost + fishCost + veggieCost;
        double desert = totalCost * 0.2;
        return totalCost + DELIVERY_PRICE + desert;
    }
}