using System;

public class Program

{

    public static void Main()

    {

        int answer = 0;

        string mode = "";

        int[] mean ={ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 ,18, 19, 20};

        for (int i =0; i < mean.Length; i++)

        {

            answer = answer + mean[i];

            int j = mean.Length - 1;

            if (mean[i] == mean[j]){

                mode += mean[j].ToString();

                j--;

            }

            else if (mode == ""){

                mode = string.Join(" ", mean);

            }

        }

        Console.WriteLine("The mode is: " + mode);

        int total = answer / mean.Length;

        Console.WriteLine("Mean is: " + total);

        int median = mean.Length / 2;

        Console.WriteLine("Median is: " + median);

    }

}