using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace blagotvoritelno
{
    class Program
    {
        static void Main(string[] args)
        {
            var D = int.Parse(Console.ReadLine());
            var S = int.Parse(Console.ReadLine());
            var T = int.Parse(Console.ReadLine());
            var G = int.Parse(Console.ReadLine());
            var P = int.Parse(Console.ReadLine());
            var torti = T * 45;
            var gofreti = G * 5.80;
            var palachinki = P * 3.20;
            var obshtoDen = (torti + gofreti + palachinki) * S;
            var allsum = obshtoDen * D;
            var summinus = allsum - (allsum * 1/8);
            Console.WriteLine($"{summinus:F2}");
        }
    }
}