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_13 (seat VARCHAR, series_4 VARCHAR)
### Question:
What is the total number of seats with gavin duffy in series 4?
### Answer:
SELECT COUNT(seat) FROM table_name_13 WHERE series_4 = "gavin duffy"