What is the highest number of gold medals Naugatuck HS won?
CREATE TABLE "percussion_scholastic_concert_open_class" (
  "ensemble" text,
  "gold_medals" real,
  "silver_medals" real,
  "bronze_medals" real,
  "total_medals" real
);
SELECT MAX("gold_medals") FROM "percussion_scholastic_concert_open_class" WHERE "ensemble"='Naugatuck HS';