What is the total when the Yugoslavia number of silver won is more than 1?
CREATE TABLE "world_championships_total_medals" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT MAX("total") FROM "world_championships_total_medals" WHERE "silver">1 AND "nation"='yugoslavia';