using System;
using System.IO;
namespace ConsoleApp1

{
    internal class Program
    {

        /// <summary>
        /// This method asks uer to input a number and checks if its format is correct
        /// </summary>
        /// <returns>input number</returns>
        private static int GetInput()
        {

            string input;
            int result;

            Console.WriteLine("Enter a number : ");
            input = Console.ReadLine();
            while (!int.TryParse(input, out result) || result < 0)
            {
                Console.WriteLine("Wrong number. Try again: ");
                input = Console.ReadLine();
            }
            return result;
        }

        /// <summary>
        /// This method fills an array with random numbers.
        /// If there are less than 50 numbers in range 0-100 to fill we only add even numbers
        /// If there are more than 50 numbers then we add 50 even numbers in range 0-100 then
        /// the rest with any numbers in range 0-900
        /// </summary>
        /// <param name="N">amount of numbers to put in array</param>
        /// <param name="array">array to fill with randoms</param>
        /// <returns>array</returns>
        static int[] Filling_randoms(int N, int[] array)
        {
            //Defining array of numbers

            Random rng = new Random();

            //Filling array with numbers
            for (int i = 0; i < (N > 50 ? 50 : N); i++)
            {
                int number;
                number = rng.Next(1, 100);
                if (number % 2 != 0)
                {
                    array[i] = number - 1;
                }
                else
                {
                    array[i] = number;
                }
            }
            if (N > 50)
            {
                for (int i = 50; i < N; i++)
                {
                    int number;
                    number = rng.Next(0, 901);
                    array[i] = number;
                }

            }
            return array;
        }

        static public void Main()
        {

            /*
            *Имя Фамилия Пике Кирилл
            *Группа ВПИ197
            */

            //Variable to keep the cycle running
            string answer = "Output.txt";

            //Cycle to rerun the program if the user desires so
            do
            {

                //Defining variables
                string path = "Output.txt";

                int N,
                    K;
                int odd = 0;

                //Asking the user for the amount of numbers in array
                do
                {
                    Console.WriteLine("Enter the values of N and K");
                    N = GetInput();
                    K = GetInput();
                }
                while (N - K < 0);


                //Defining array of numbers
                int[] arrayOfNumbers = new int[N];

                //Filling array with random numbers
                try
                {
                    arrayOfNumbers = Filling_randoms(N, arrayOfNumbers);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                    Console.ReadLine();
                    return;
                }

                int first_last;

                first_last = arrayOfNumbers[0] + arrayOfNumbers[N - 1];

                //Defining string
                string stringOfNumbers = "";

                //Converting array into string
                for (int i = 1; i < N + 1; i++)
                {
                    if (i % K == 0)
                    {
                        if (arrayOfNumbers[i - 1] % 2 != 0)
                        {
                            odd += 1;
                        }
                        stringOfNumbers += arrayOfNumbers[i - 1] + " ";
                    }
                }

                stringOfNumbers += Environment.NewLine + first_last;
                stringOfNumbers += Environment.NewLine + odd;

                Console.WriteLine(stringOfNumbers);

                //Writing the string in the file
                try
                {
                    File.WriteAllText(path, stringOfNumbers);

                }

                catch (Exception ex)

                {
                    Console.WriteLine(ex.Message);
                    Console.ReadLine();

                    return;

                }

                //Checking if the user wants to rerun the program
                Console.WriteLine("Do you want to repeat? [Yes/No]");
                answer = Console.ReadLine();


            }

            while (answer == "Yes" || answer == "yes");



        }
    }
}