How many different isolation numbers does the Jack Mountain peak have?
CREATE TABLE "the_18_washington_mountain_peaks_with_27" (
  "rank" real,
  "mountain_peak" text,
  "mountain_range" text,
  "elevation" text,
  "prominence" text,
  "isolation" text
);
SELECT COUNT("isolation") FROM "the_18_washington_mountain_peaks_with_27" WHERE "mountain_peak"='Jack Mountain';