using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        char[] char_array = {(char)12, (char)7, (char)16,(char)3, (char)21 };

        var int_array = Array.ConvertAll(char_array, c => Convert.ToInt32(c));

        var min = int_array.Min(c => c);

        var max = int_array.Max(c => c);

        var average = int_array.Average(c => c);

        Console.WriteLine("Najmniejsza liczba: " + min);

        Console.WriteLine("Największa liczba: " + max);

        Console.WriteLine("Średnia to: " + average);

        Console.WriteLine("Trzecia liczba: " + int_array.GetValue(2));

    }

}