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_11240028_3 (portrayed_by VARCHAR, relationship VARCHAR)
### Question:
How many characters were portrayed by the informant of don flack?
### Answer:
SELECT COUNT(portrayed_by) FROM table_11240028_3 WHERE relationship = "Informant of Don Flack"