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_3005999_1 (route_number VARCHAR, origin VARCHAR, destination VARCHAR)
### Question:
How many route numbers occur for the origin of Birmingham and destination of Bristol?
### Answer:
SELECT COUNT(route_number) FROM table_3005999_1 WHERE origin = "Birmingham" AND destination = "Bristol"