using System;


class Program
{
    static void Main(string[] args)
    {
        float money = float.Parse(Console.ReadLine());
        float floorWidth = float.Parse(Console.ReadLine());
        float floorLength = float.Parse(Console.ReadLine());
        float triangleSide = float.Parse(Console.ReadLine());
        float triangleHeigh = float.Parse(Console.ReadLine());
        float pricePerTile = float.Parse(Console.ReadLine());
        float expenses = float.Parse(Console.ReadLine());
        double floorArea = floorWidth * floorLength;
        double tileArea = triangleSide * triangleHeigh / 2;
        double numOfTiles = Math.Ceiling(floorArea / tileArea) + 5;
        double totalSum = numOfTiles * pricePerTile + expenses;
        double res = Math.Abs(money - totalSum);
        if (money >= totalSum) Console.WriteLine("{0} lv left.", res.ToString("F"));
        else if (money < totalSum) Console.WriteLine("You'll need {0} lv more.", res.ToString("F"));
    }
}