user: Question: What is the total number of Round(s), when Time is "n/a", and when Location is "canton, ohio, usa"?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '12-7', 'Mark Bocek', 'Submission (triangle choke)', 1.0, '2:33', 'Montreal, Quebec , Canada']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Time" = 'n/a' AND "Location" = 'canton, ohio, usa';