How many locations have been used for ballparks named Memorial Stadium?
CREATE TABLE "table1_1987995_5" (
  "ballpark" text,
  "location" text,
  "team" text,
  "opened" real,
  "closed" real,
  "demod" real,
  "current_status" text
);
SELECT COUNT("location") FROM "table1_1987995_5" WHERE "ballpark"='Memorial Stadium';