What is the number of jews where the rank is 1?
CREATE TABLE "metropolitan_areas_with_largest_jewish_p" (
  "rank_wjc" real,
  "rank_arda" real,
  "metro_area" text,
  "number_of_jews_wjc" real,
  "number_of_jews_asarb" real
);
SELECT COUNT("number_of_jews_wjc") FROM "metropolitan_areas_with_largest_jewish_p" WHERE "rank_arda"=1;