What was the sum of the rounds for the player who had a position of LS and an overall draft pick bigger than 230?
CREATE TABLE "washington_redskins_draft_history" (
  "round" real,
  "pick" real,
  "overall" real,
  "name" text,
  "position" text,
  "college" text
);
SELECT SUM("round") FROM "washington_redskins_draft_history" WHERE "position"='ls' AND "overall">230;