user: Question: How many total rounds have the results of win, and n/a as the method?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '4-3', 'Wesley Correira', 'TKO (knees and punches)', 'UFC 42', 2.0, '1:46', 'Florida , United States']
SQL:

assistant: SELECT SUM("Round") FROM "Table" WHERE "Res." = 'win' AND "Method" = 'n/a';