What is the sum of all rounds where a Tennessee State player with an overall rank less than 261 was drafted?
CREATE TABLE "nfl_draft" (
  "round" real,
  "overall" real,
  "player" text,
  "position" text,
  "school_club_team" text
);
SELECT COUNT("round") FROM "nfl_draft" WHERE "school_club_team"='tennessee state' AND "overall"<261;