ft

package FirstStepsInCoding.Exc.lab;

import java.util.Scanner;

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

        int l = Integer.parseInt(s.nextLine());
        int w = Integer.parseInt(s.nextLine());
        int h = Integer.parseInt(s.nextLine());
        double per = Double.parseDouble(s.nextLine());

        int volCM = l * w * h;
        double volL = volCM * 0.01;
        double nedL = volL - volL * per / 100;

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


    }
}