Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many semi-final weeks are there for acts from Pittsburgh, Pennsylvania?

### Inputs:
table_name: table, columns: ['Name/Name of Act', 'Age(s)', 'Genre', 'Act', 'Hometown', 'Qtr. Final (Week)', 'Semi Final (Week)', 'Position Reached']

### Response:
SELECT COUNT Semi Final (Week) FROM table WHERE Hometown = Pittsburgh, Pennsylvania