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);
}
}
}
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