public static void Main(string[] args)
{
string[] tokens = Console.ReadLine().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).ToArray();
decimal pricePerDay = decimal.Parse(tokens[0]);
int numberOfDays = int.Parse(tokens[1]);
Season season = Enum.Parse <Season>(tokens[2]);
bool thereIsDiscount = tokens.Length == 4;
DiscountType discount = thereIsDiscount ? Enum.Parse <DiscountType>(tokens[3]):DiscountType.None;
PriceCalculator newCalculator = new PriceCalculator();
decimal price = newCalculator.CalculateThisPriceAnimal(pricePerDay, numberOfDays, season, discount);
Console.WriteLine($"{price:F2}");
}