using System;

public class Program

{

    static bool kiemTraNguyenTo(int N)

        {

            bool laNguyenTo = true;

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

            {

                if (N%i==0)

                {

                    laNguyenTo = false;

                    break;

                }

            }

            return laNguyenTo;

        }

        static void LietKeNguyenTo(int N)

        {

            for (int i = 2; i <= N; i++)

            {

                if (kiemTraNguyenTo(i))

                {

                    Console.Write(i + ", ");

                }

            }

        }

    public static void Main()

    {

        Console.WriteLine("Nhap so N: ");

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

        LietKeNguyenTo(N);

    }

}