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_11630008_7 (series__number VARCHAR, production_code VARCHAR)
### Question:
What is the number of series with production code 503?
### Answer:
SELECT COUNT(series__number) FROM table_11630008_7 WHERE production_code = 503