What is the sum of heat for christophe lebon when lane is less than 4?
CREATE TABLE "heats" (
  "rank" real,
  "heat" real,
  "lane" real,
  "name" text,
  "nationality" text,
  "time" text
);
SELECT COUNT("heat") FROM "heats" WHERE "lane"<4 AND "name"='christophe lebon';