using System;

​

public class Program

{

    public static void Main()

    {

        //Silvana Chávez

        int num;

        int div = 0;

        Console.WriteLine("Write a number. I´ll tell you if its  prime or not");

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

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

        {

            if (num % i == 0)

            {

                div++;

            }

        }

​

        if (div == 2)

        {

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

        }

        else

        {

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

        }

    }

}