using System;

​

public class Program

{

    public static void Main()

    {

        //What is the 10 001st prime number?

        int counter = 0;

        int numberToCheck = 2;

        while (true)

        {

            if (IsPrime(numberToCheck))

            {

                counter = counter + 1;

            }

​

            if (counter == 10001)

                break;

            numberToCheck = numberToCheck + 1;

        }

​

        Console.WriteLine("10001st prime number is {0}", numberToCheck);

    }

​

    static bool IsPrime(int numberToCheck)

    {

        if (numberToCheck < 2)

            return false;

        for (int i = 2; i < numberToCheck; i++)

        {

            if (numberToCheck % i == 0)

                return false;

        }

​

        return true;

    }

}