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);