using System;

public class Program

{

    public static void Main()

    {

        //rUBÉN f. aLMONTE 

        int num, div; 

        div = 0;

        Console.WriteLine("Hi! Please write a number and I'll tell you if it's prime or not");

        num = int.Parse(Console.ReadLine());

        for (int c = 1; c <= num; c++)

        {

        if (num % c == 0)

            {

                div++;

            }

            }

        if(div == 2)

            {

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

            }

        else

            {

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

            }

    }

 }