Can you tell me the sum of Score that has the Place of t5, and the Country of united states, and the Player of jeff maggert?
CREATE TABLE "first_round" (
  "place" text,
  "player" text,
  "country" text,
  "score" real,
  "to_par" text
);
SELECT SUM("score") FROM "first_round" WHERE "place"='t5' AND "country"='united states' AND "player"='jeff maggert';