06. Fishland

using System;


namespace FishMarket
{
    class Program
    {
        static void Main(string[] args)
        {
            double mackerelPrice = double.Parse(Console.ReadLine());
            double spratPrice = double.Parse(Console.ReadLine());
            double bonitoFishKg = double.Parse(Console.ReadLine());
            double saffronKg = double.Parse(Console.ReadLine());
            double shellKg = double.Parse(Console.ReadLine());

            double bonitoFishSum = bonitoFishKg * mackerelPrice * 1.60;
            double saffronSum = saffronKg * spratPrice * 1.80;
            double shellSum = shellKg * 7.50;
            double sum = bonitoFishSum + saffronSum + shellSum;

            Console.WriteLine($"{sum:F2}");
        }
    }
}