How many entries are shown for school colors for the location of naga , camarines sur?
CREATE TABLE "tertiary_institutions" (
  "institution" text,
  "location" text,
  "enrollment" text,
  "athletic_nickname" text,
  "school_colors" text,
  "founded" real
);
SELECT COUNT("school_colors") FROM "tertiary_institutions" WHERE "location"='Naga , Camarines Sur';