using System;

namespace Fuel_Tank
{
    class Program
    {
        static void Main(string[] args)
        {
            string fuel = Console.ReadLine().ToLower();
            int liters = int.Parse(Console.ReadLine());

            if (liters >= 25)
            {
                Console.WriteLine($"You have enough {fuel}.");
            }
            else if (liters < 25)
            {
                Console.WriteLine($"Fill your tank with {fuel}!");
            }
            else
            {
                Console.WriteLine("Invalid fuel!");
            }
        }
    }
}