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

### Instruction:
How many celebrities had an 18October2007 Original air Date?

### Inputs:
table_name: table, columns: ['Total No.', 'Celebrity', 'Director', 'Original air date', 'Viewers']

### Response:
SELECT COUNT Celebrity FROM table WHERE Original air date = 18October2007