using System;

public class Program

{

    public static void Main()

    {

         Console.Write("Nhap vao so n: ");

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

            String dem = "";

            for (int m = 2; m <= n; m++)

            {

                int u = 0;

                for (int k = 1; k <= m; k++)

                {

                    if (m % k == 0) u++;

                }

                if (u == 2) dem += m + " ";   

            }

            Console.WriteLine("Cac so nguyen to nho hon {0} la ", n );

            Console.WriteLine(dem);

            Console.ReadKey();

    }

}