What is the total score for a location of san francisco, california, and a year after 1987, and a to pa [a] of +1?
CREATE TABLE "u_s_open_champions" (
  "year" real,
  "country" text,
  "course" text,
  "location" text,
  "total_score" text,
  "to_par_a" text
);
SELECT "total_score" FROM "u_s_open_champions" WHERE "location"='san francisco, california' AND "year">1987 AND "to_par_a"='+1';