user: Question: Silver larger than 0, and a Total smaller than 3, and a Nation of bulgaria, and a Bronze smaller than 0 had what sum of gold?
Columns: ['Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Ukraine', 4.0, 0.0, 1.0, 5.0]
SQL:

assistant: SELECT SUM("Gold") FROM "Table" WHERE "Silver" > 0.0 AND "Total" < 3.0 AND "Nation" = 'bulgaria' AND "Bronze" < 0.0;