user: Question: What is the sum of the bronze medals of the nation with less than 0 silvers?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'China', 6.0, 3.0, 2.0, 11.0]
SQL:

assistant: SELECT SUM("Bronze") FROM "Table" WHERE "Silver" < 0.0;