using System;
using System.Collections.Generic;
using System.Linq;

class One
{
    static void Main()
    {
        double[] input = new double[5];

        for (int i = 0; i < input.Length; i++)
        {
            input[i] = double.Parse(Console.ReadLine());
        }

        double rubles = input[0];
        double dollars = input[1];
        double euros = input[2];
        double specialOffer = input[3];
        double mSite = input[4];

        double[] prices = new double[5];

        prices[0] = ((rubles / 100) * 3.5);
        prices[1] = (dollars * 1.5);
        prices[2] = (euros * 1.95);
        prices[3] = (specialOffer / 2);
        prices[4] = mSite;

        Console.WriteLine("{0:0.00}", prices.Min());

    }
}