using System;

public class Program

{

    public static void Main()

    {

        int counter1;

        int counter2 = 0;

        Console.WriteLine("This is my homework");

        Console.WriteLine("-------------------");

        for(int i = 1; i <= 100000; i++)

        {

            counter1 = 0;

            for (int j = 2; j <= i/2; j++)

            {

                if(i % j == 0)

                {

                    ++counter1;

                    break;

                }

            }

            if(counter1 == 0 && i != 1 )

            {

                ++counter2;

            }  

        }

        Console.WriteLine("{0} of the numbers are prime", counter2);

    }

}