CREATE TABLE table_name_51 (gold INT, bronze VARCHAR, nation VARCHAR, silver VARCHAR, total VARCHAR)

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?
SELECT SUM(gold) FROM table_name_51 WHERE silver > 0 AND total < 3 AND nation = "bulgaria" AND bronze < 0
SELECT SUM("gold") FROM "table_name_51" WHERE "bronze" < 0 AND "bulgaria" = "nation" AND "silver" > 0 AND "total" < 3