Name the total number of population hervey bay with population woocoo less than 640 and population of maryborough less than 19,257
CREATE TABLE "population" (
  "year" real,
  "population_region_total" real,
  "population_maryborough" real,
  "population_hervey_bay" real,
  "population_woocoo" real,
  "population_tiaro" real
);
SELECT COUNT("population_hervey_bay") FROM "population" WHERE "population_woocoo"<640 AND "population_maryborough"<'19,257';