using System;
    class MutantSquirrels
    {
        static void Main()
        {
            double Trees = double.Parse(Console.ReadLine());
            double Branches = double.Parse(Console.ReadLine());
            double Squirrels = double.Parse(Console.ReadLine());
            double AverageTails = double.Parse(Console.ReadLine());

            double TotalTails = Trees * Branches * Squirrels * AverageTails;

            if (TotalTails % 2 == 0)
            {
                TotalTails *= 376439;
                Console.WriteLine("{0:F3}", TotalTails);
            }
            else
            {
                TotalTails /= 7;
                Console.WriteLine("{0:F3}", TotalTails);
            }
        }
    }