using System;
using System.Text.RegularExpressions;

namespace Regex_test
{
    class Program
    {
        static void Main(string[] args)
        {
            double money = double.Parse(Console.ReadLine());
            int Students = int.Parse(Console.ReadLine());
            double prizeSabers = double.Parse(Console.ReadLine());

            double freeSaber = Math.Ceiling(Students * 1.1);

            //while (copyStudents % 6 == 0 && copyStudents > 0)
            //{
            //    copyStudents -= 6;
            //    Count++;

            //}
            int Count = (int)(Students/6);


            double prizeOfRobes = double.Parse(Console.ReadLine());
            double prizeOfBelts = double.Parse(Console.ReadLine());
            double cost = (Students - Count) * prizeOfBelts + Students * prizeOfRobes + (freeSaber * prizeSabers);

            //if (money - cost > 0)
            if (money - cost >= 0)
            {
                Console.WriteLine($"The money is enough - it would cost {cost:F2}lv.");
            }
            else
            {
                Console.WriteLine($"Ivan Cho will need {(cost - money):F2}lv more.");
            }


        }
    }
}