user: Question: What is the least amount of silver medals won by total with more than 1 bronze and more than 18 total medals won?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Finland', 6.0, 4.0, 3.0, 13.0]
SQL:

assistant: SELECT MIN("Silver") FROM "Table" WHERE "Bronze" > 1.0 AND "Nation" = 'total' AND "Total" > 18.0;