using System;

public class Program
{
	public static void Main()
	{
		double moneyTheyHave = double.Parse(Console.ReadLine());
		int studentsCount = int.Parse(Console.ReadLine());
		double priceOflightsabers = double.Parse(Console.ReadLine());
		double priceOfrobes = double.Parse(Console.ReadLine());
		double priceOfbelts = double.Parse(Console.ReadLine());

		double totalPrice = 0;
		int freeBeltsCount = studentsCount/6;

		totalPrice = Math.Ceiling(studentsCount * 1.1)* priceOflightsabers + studentsCount * priceOfrobes + (studentsCount - freeBeltsCount) * priceOfbelts;

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


	}
}