using System;

public class Program

{

    public static void Main()

    {

        var skum=double.Parse(Console.ReadLine());

        var caca=double.Parse(Console.ReadLine());

        var pal=double.Parse(Console.ReadLine());

            var safrid=double.Parse(Console.ReadLine());

            var midi=double.Parse(Console.ReadLine());

        var ps=skum+skum*0.6;

            var safridcena=caca+caca*0.8;

        var midicena=7.5;

        var obshto=ps*pal+safridcena*safrid+midi*7.5;

        Console.WriteLine(obshto);

    }

}