How many times did kingfisher east bengal fc win?
CREATE TABLE "performances_by_clubs" (
  "num" real,
  "nation" text,
  "winners" real,
  "runners_up" real,
  "3rd_place" real,
  "4th_place" real
);
SELECT MIN("winners") FROM "performances_by_clubs" WHERE "nation"='Kingfisher East Bengal FC';