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

### Instruction:
What is the number of viewers in millions for the episode on October 10, 2008, and a Channel 4 weekly rank a smaller than 30?

### Inputs:
table_name: table, columns: ['Episode #', 'Title', 'Airdate', 'Viewers (millions)', 'Channel 4 weekly rank a']

### Response:
SELECT COUNT Viewers (millions) FROM table WHERE Airdate = october 10, 2008 AND Channel 4 weekly rank a < 30