user: Question: what is the highest amount of silver when gold is 0 for Soviet Union?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'West Germany', 3.0, 1.0, 1.0, 5.0]
SQL:

assistant: SELECT MAX("Silver") FROM "Table" WHERE "Gold" = 0.0 AND "Nation" = 'Soviet Union';