9. Fish Tank

using System;

namespace FishTank
{
internal class Program
{
    static void Main(string[] args)
    {
        int length = int.Parse(Console.ReadLine());
        int width = int.Parse(Console.ReadLine());
        int height = int.Parse(Console.ReadLine());
        double procent = double.Parse(Console.ReadLine());

        double aquariumVolume = length * width * height;
        double volumeInLiters = aquariumVolume * 0.001;
        double filledSpace = procent * 0.01;
        double neededSpace = volumeInLiters * (1 - filledSpace);

        Console.WriteLine(neededSpace);
    }
}
}