public static void Main(string[] args) { int n = int.Parse(Console.ReadLine()); double m = double.Parse(Console.ReadLine()); List <Mushroom> mushrooms = new List <Mushroom>(n); for (int i = 0; i < n; i++) { try { mushrooms.Add(Mushroom.Parse(Console.ReadLine())); } catch (ArgumentException e) { Console.WriteLine(e.Message); } } double average = Mushroom.GetAverageDiameter(mushrooms, m); Console.WriteLine(average.ToString("F2")); }