Fishland

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IzpitniZadachi7lekciq
{
    class Fishland
    {
        static void Main(string[] args)
        {
            double skumriaPrice = double.Parse(Console.ReadLine());
            double cacaPrice = double.Parse(Console.ReadLine());
            double palamudKG = double.Parse(Console.ReadLine());
            double safridKG = double.Parse(Console.ReadLine());
            double midiKG = double.Parse(Console.ReadLine());
            double sumaPalamud = palamudKG * 1.6 * skumriaPrice;
            double sumaSafrid = safridKG * 1.8 * cacaPrice;
            double sumaMidi = 7.5 * midiKG;
            double result = sumaMidi + sumaPalamud + sumaSafrid;

            Console.WriteLine("{0:F2}", result);


        }
    }
}