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_17968233_2 (aggregate VARCHAR, home__2nd_leg_ VARCHAR)
### Question:
If the second leg is Instituto, what is the total number of aggregate?
### Answer:
SELECT COUNT(aggregate) FROM table_17968233_2 WHERE home__2nd_leg_ = "Instituto"