Fishland

using System;

namespace Fishland
{
    class Program
    {
        static void Main(string[] args)
        {
            var mackerelKgPrice = double.Parse(Console.ReadLine());
            var spratKgPrice = double.Parse(Console.ReadLine());
            var beltedBonitoKg = double.Parse(Console.ReadLine());
            var horseMackerelKg = double.Parse(Console.ReadLine());
            var seashellsKg = int.Parse(Console.ReadLine());

            var beltedBonitoSumPrice = (mackerelKgPrice + (mackerelKgPrice * 0.6)) * beltedBonitoKg;
            var horseMackerelSumPrice = (spratKgPrice + (spratKgPrice * 0.8)) * horseMackerelKg;
            var seashellsSumPrice = seashellsKg * 7.5;

            var totalPrice = beltedBonitoSumPrice + horseMackerelSumPrice + seashellsSumPrice;

            Console.WriteLine($"{totalPrice:f2}");

        }
    }
}