using System;

public class Program

{

    public static void Main()

    {

        int n, i, j, ocno = 0, dn;

         Console.Write("Nhap n ");

            n = Convert.ToInt32(Console.ReadLine());

            dn = n;

            i = 1;

​

            for (j = n; j > 0; j = j / 10)

            {

                ocno = ocno + (j % 10) * i;

                i = i * 8;

                n = n / 10;

            }

​

            Console.Write("ket qua {0} la {1}.", dn, ocno);   

​

​

    }

}