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_27529608_21 (semi_final__week_ VARCHAR, hometown VARCHAR)
### Question:
How many semi-final weeks are there for acts from Pittsburgh, Pennsylvania?
### Answer:
SELECT COUNT(semi_final__week_) FROM table_27529608_21 WHERE hometown = "Pittsburgh, Pennsylvania"