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_25716397_1 (directed_by VARCHAR, series_no VARCHAR)
### Question:
How many directors of episode 55?
### Answer:
SELECT COUNT(directed_by) FROM table_25716397_1 WHERE series_no = 55