user: Question: Farr Yacht Design designed boats for how many country/flags?
Columns: ['Team & Boat name', 'Sail no.', 'Flag', 'Design Firm', 'Builder', 'Skipper']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Ericsson Racing Team Ericsson 3 - Nordic crew', 'SWE 3', 'Sweden', 'Juan Kouyoumdjian', 'Killian Bushe', 'Magnus Olsson (Leg 4- ) Anders Lewander (Leg 1-3)']
SQL:

assistant: SELECT COUNT("Flag") FROM "Table" WHERE "Design Firm" = 'Farr Yacht Design';