BirthDay

import java.util.Scanner;

public class P14BirthDay {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        Double lenght = Double.parseDouble(scanner.nextLine());
        Double width  = Double.parseDouble(scanner.nextLine());
        Double height = Double.parseDouble(scanner.nextLine());
        Double percentage = Double.parseDouble(scanner.nextLine());

        Double volume = lenght * width * height;
        Double litres = volume * 0.001;
        Double percentagevolume = percentage * 0.01;

        Double result = litres *(1 - percentagevolume);

        System.out.printf("%.3f", result);

    }
}