Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Can you tell me the sun of Population that has the Country/Region of hong kong, and the Rank smaller than 2?

### Inputs:
table_name: table, columns: ['Rank', 'Country/Region', 'Population', 'Area (km 2 )', 'Density (Pop. per km 2 )']

### Response:
SELECT SUM Population FROM table WHERE Country/Region = hong kong AND Rank < 2