text: 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_name_24 (series_number VARCHAR, dvd_region_1_release_date VARCHAR, original_air_date VARCHAR, number_of_episodes VARCHAR)
  ### Question:
  How many series originally aired before 1999 with more than 7 episodes and a DVD Region 1 release date of 16 april 2013?
  ### Answer:
  SELECT COUNT(series_number) FROM table_name_24 WHERE original_air_date < 1999 AND number_of_episodes > 7 AND dvd_region_1_release_date = "16 april 2013"