using System;

​

namespace Cau030

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.Write("Nhap n = ");

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

            int S = 0;

            for (int i = 1; i < n/2; i++)

            {

                if (n % i == 0)

                {

                    S += i;

                }

            }

            if (S == n)

                Console.WriteLine("n la so hoan thien");

            else

                Console.WriteLine("n ko la so hoan thien");

        }

    }

}