What is the number of Last Runners-up that has the club name of dempo sc?
CREATE TABLE "performance_of_indian_teams" (
  "club" text,
  "wins" real,
  "last_win" text,
  "runners_up" real,
  "last_runners_up" real
);
SELECT SUM("last_runners_up") FROM "performance_of_indian_teams" WHERE "club"='dempo sc';