FishMarket

using System;

namespace FishMarket
{
    class FishMarket
    {
        static void Main(string[] args)
        {
            double mackerel = double.Parse(Console.ReadLine()); // скумрия лв/кг
            double sprat = double.Parse(Console.ReadLine()); // цаца лв/кг
            double beltedbonito = double.Parse(Console.ReadLine()); // паламуд -кг
            double scad = double.Parse(Console.ReadLine()); // сафрид- кг
            int clams = int.Parse(Console.ReadLine()); // миди  -кг
            double priceBeltedbonito = mackerel + mackerel * 0.6;
            double priceScad = sprat + sprat *0.8;
            double priceClams = 7.50;
            double many = priceBeltedbonito * beltedbonito + priceScad * scad + (double)priceClams * clams;
            Console.WriteLine($"{many:f2}");
        }
    }
}