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_45 (population INTEGER, country_region VARCHAR, rank VARCHAR)
### Question:
Can you tell me the sun of Population that has the Country/Region of hong kong, and the Rank smaller than 2?
### Answer:
SELECT SUM(population) FROM table_name_45 WHERE country_region = "hong kong" AND rank < 2