01.2.09FishTank

import java.util.Scanner;

public class ex09FishTank {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double length = Integer.parseInt(scanner.nextLine()) * 0.1;
        double width = Integer.parseInt(scanner.nextLine()) * 0.1;
        double height = Integer.parseInt(scanner.nextLine()) * 0.1;
        double percentOfFill = Double.parseDouble(scanner.nextLine());

        double volume = length * width * height;
        volume = volume - volume * percentOfFill / 100;

        System.out.println(volume);

    }
}