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_11642945_1 (celebrity VARCHAR, original_air_date VARCHAR)
### Question:
How many celebrities had an 18October2007 Original air Date?
### Answer:
SELECT COUNT(celebrity) FROM table_11642945_1 WHERE original_air_date = "18October2007"