What was the total city area for vehari city with a serial number bigger than 36?
CREATE TABLE "punjab" (
  "serial_no" real,
  "district" text,
  "headquartered_city" text,
  "city_population_2009" real,
  "city_area_km_2" real
);
SELECT COUNT("city_area_km_2") FROM "punjab" WHERE "headquartered_city"='vehari city' AND "serial_no">36;