What is the sum of Rank that when the Singapore Cup is 0 (1), and the Name is masrezwan masturi?
CREATE TABLE "goalscorers" (
  "rank" real,
  "name" text,
  "s_league" text,
  "singapore_cup" text,
  "singapore_league_cup" text,
  "total" text
);
SELECT SUM("rank") FROM "goalscorers" WHERE "singapore_cup"='0 (1)' AND "name"='masrezwan masturi';