using System;

public class Program

{

    public static void Main()

    {

        int lenght = int.Parse(Console.ReadLine());

        int width = int.Parse(Console.ReadLine());

        int height = int.Parse(Console.ReadLine());

        double percent = double.Parse(Console.ReadLine);

            int volume = lenght * width * height;

        double volumeInLiters = volume * 0.001;

        double finalPercent = percent * 0.01;

        double finalSum=volumeInLiters*(1-finalPercent);

        Console.WriteLine($"{finalSum:f3}");

    }

}