using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

​

        int targetNumOfPrimes;

        int primeCounter = 3;

        List<int> primes = new List<int>();

        primes.Add(2);

        bool isRunning = true;

​

        while (isRunning)

        {

            Console.WriteLine("How many primes do you want to calculate?");

            while (!int.TryParse(Console.ReadLine(), out targetNumOfPrimes))

            {

                Console.WriteLine("Error, not an integer value.");

            }

            while (primeCounter < targetNumOfPrimes)

            {

                bool isPrime = true;

                foreach (var num in primes)

                {

                    if (primeCounter % num == 0)

                    {

                        isPrime = false;

                    }

                }

                if (isPrime)

                {

                    primes.Add(primeCounter);

                }

                primeCounter += 2;

            }

            foreach (var num in primes)

            {

                Console.WriteLine(num);

            }

            Console.WriteLine("Go again?");

            if (!Console.ReadLine().ToLower().Equals("y"))

            {

                isRunning = false;

            }

        }

​

    }

}