% Рожден ден

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)
        {
            var lenght = int.Parse(Console.ReadLine());
            var witdth = int.Parse(Console.ReadLine());
            var height = int.Parse(Console.ReadLine());

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

            var volume = lenght * witdth * height;
            var allLitres = volume * 0.001;
            var percentage = percent * 0.01;



            var neceseryLiters = allLitres * (1 - percentage);




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

        }
    }
}