static void Main(string[] args)
{
do
{
int n;
n = SoNguyen.NhapSoNguyenDuong("Nhap n = ");
Console.Write("Tong tat cac uoc so nho hon chinh no la " + TinhToan.tonguoc(n));
} while (SoNguyen.NhapSoNguyen("\nTiep tuc (1.Tiep, 0.Khong) ? ") != 0);
}