user: Question: How many kids go to Brechin High School?
Columns: ['School', 'Location', 'Catchment', 'Roll', 'Gender', 'External link']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Arbroath Academy', 'Arbroath', 'North-east Arbroath and surrounding areas', 630.0, 'Mixed', 'Arbroath Academy']
SQL:

assistant: SELECT "Roll" FROM "Table" WHERE "School" = 'Brechin High School';