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

### Instruction:
How many share figures are there for the episode that aired on October 17, 2007?

### Inputs:
table_name: table, columns: ['#', 'Episode', 'Air Date', 'Timeslot (EST)', 'Rating', 'Share', '18-49 (Rating/Share)', 'Viewers (m)', 'Weekly Rank (#)']

### Response:
SELECT COUNT Share FROM table WHERE Air Date = October 17, 2007