Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_56 (rank INTEGER, code__iata_icao_ VARCHAR)
### Question:
What is the highest rank for the airport with a code of HKG/VHHH?
### Answer:
SELECT MAX(rank) FROM table_name_56 WHERE code__iata_icao_ = "hkg/vhhh"