user: Question: The k-1 mma romanex event went how many rounds?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '5–4', 'Alexander Emelianenko', 'KO (punches)', 'Bushido Europe: Rotterdam Rumble', 1.0, '0:28', 'Rotterdam , Netherlands']
SQL:

assistant: SELECT SUM("Round") FROM "Table" WHERE "Event" = 'k-1 mma romanex';