using System;

public class Program

{

    public static void Main()

    {

            int num , nn = 1 , aa = 0;

            Console.Write(" Enter number: ");

            num = Convert.ToInt32(Console.ReadLine());

            while (nn <= num)

            {

            if (num % nn == 0 )

            {

              aa ++;    

            }

              nn ++;

            }

            if(num == 0 && num == 1)

            {

            Console.Write("The number is not prime.");

            }

            else if (aa == 2)

            {

            Console.Write("The number is prime.");  

            }

            else

            {

            Console.Write("The number is not prime.");

            }

    }

}