using System;

public class Program

{

    public static void Main()

    {

        // Diego Zayd Valdez

            Console.WriteLine("Write as many numbers as you want but once you write zero I will tell you how many prime numbers you wrote");

        int n;

        int el = 0;

        int av = 0;

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

        do 

        {

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

        {

            if (n % i == 0)

            {

                av = av + 1;

            }

        }

​

        if (av == 2)

        {

            el++;

        }

            av = 0;

        }

        while ( n != 0);

        Console.WriteLine("You wrote " + el + " prime numbers");

    }

}