user: Question: How many semi-final weeks are there for acts from Pittsburgh, Pennsylvania?
Columns: ['Name/Name of Act', 'Age(s)', 'Genre', 'Act', 'Hometown', 'Qtr. Final (Week)', 'Semi Final (Week)', 'Position Reached']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Michael Grimm', '30', 'Singing', 'Singer/Musician', 'Hancock County, Mississippi', 2.0, '1', 'Winner']
SQL:

assistant: SELECT COUNT("Semi Final (Week)") FROM "Table" WHERE "Hometown" = 'Pittsburgh, Pennsylvania';