Prime Number

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Is_a_number_prime
{
    class Program
    {
        static void Main(string[] args)
        {

            var n = int.Parse(Console.ReadLine());
            var prime = true;
            if (n > 1)
            {
                for (var i = 2; i < Math.Sqrt(n); i++)
                    if (n % i == 0)
                    {
                        prime = false;
                        break;
                    }
                if (prime) Console.WriteLine("Prime");
                else Console.WriteLine("Not prime");
            }
            else
            {
                Console.WriteLine("Not prime");
            }

        }
    }
}