using System;

​

public class Program

{

    public static void Main()

    {

        //Luisa Weissbach

        int num, num2, a;

        num2 = 0;

        a = 0;

        num = 1;

        Console.WriteLine("Hello, write as many numbers as you want until you write a zero, I´ll tell you all the prime numbers you wrote");

        while (num != 0)

        {

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

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

            {

                if (num % c == 0)

                {

                    num2++;

                }

            }

​

            if (num2 == 2)

            {

                a++;

            }

            num2 = 0;

        }

​

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

    }

}