using System;

namespace CharityCampaign
{
    class Program
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine());
            int bakersCount = int.Parse(Console.ReadLine());
            int cakes = int.Parse(Console.ReadLine());
            int waffles = int.Parse(Console.ReadLine());
            int pancakes = int.Parse(Console.ReadLine());

            double cakesPerDay = cakes * 45;
            double wafflesPerDay = waffles * 5.80;
            double pancakesPerDay = pancakes * 3.20;
            double sumPerDay = (cakesPerDay + wafflesPerDay + pancakesPerDay) * bakersCount;
            double totalSumOfCampaign = sumPerDay * days;
            double result = totalSumOfCampaign - (totalSumOfCampaign * 1 / 8);

            Console.WriteLine(result);
        }
    }
}