user: Question: What is the total number of silver medals when there are 0 Bronze medals, and the nation is the united kingdom?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Canada', 2.0, 0.0, 3.0, 5.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Bronze" = 0.0 AND "Nation" = 'united kingdom';