ff

using System;

namespace k
{
    class Program
    {
        static void Main(string[] args)
        {
            double priceStrawberries = double.Parse(Console.ReadLine());

            double quantityBanana = double.Parse(Console.ReadLine());
            double quantityOrange = double.Parse(Console.ReadLine());
            double quantityMalini = double.Parse(Console.ReadLine());
            double quantityStrawberries = double.Parse(Console.ReadLine());

            double priceMalini = (priceStrawberries / 2)* quantityMalini;
            double priceOrange = priceMalini - (priceStrawberries * 0.40) * quantityOrange;
            double priceBanana = priceMalini - (priceStrawberries * 0.80) * quantityBanana;
            double totalPriceStrawberries = quantityStrawberries * priceStrawberries;

            double finalSum = priceMalini + priceBanana +priceOrange+ totalPriceStrawberries;
            Console.WriteLine($"{finalSum:f2}");
        }
    }
}