What is the sum of the total As of team bucheon sk, who had the chunnam dragons as their opponent at the bucheon venue?
CREATE TABLE "members" (
  "name" text,
  "date" text,
  "goals" real,
  "assists" real,
  "team" text,
  "venue" text,
  "opponent" text,
  "competition" text,
  "total_gs" real,
  "total_as" real
);
SELECT SUM("total_as") FROM "members" WHERE "team"='bucheon sk' AND "opponent"='chunnam dragons' AND "venue"='bucheon';