Whatis the total number of half marathon (mens) that represented kazakhstan?
CREATE TABLE "winners_by_country" (
  "country" text,
  "total" real,
  "marathon_mens" real,
  "marathon_womens" real,
  "half_marathon_mens" real,
  "half_marathon_womens" real
);
SELECT COUNT("half_marathon_mens") FROM "winners_by_country" WHERE "country"='Kazakhstan';