What is the sum of Money of the game that was played in the United States with Sam Snead as a player?
CREATE TABLE "final_leaderboard" (
  "place" text,
  "player" text,
  "country" text,
  "score" text,
  "to_par" text,
  "money" real
);
SELECT SUM("money") FROM "final_leaderboard" WHERE "country"='united states' AND "player"='sam snead';