What is the total of medium earth orbital regime, accidentally achieved and successes greater than 3?
CREATE TABLE "by_orbit" (
  "orbital_regime" text,
  "launches" real,
  "successes" real,
  "failures" real,
  "accidentally_achieved" real
);
SELECT SUM("accidentally_achieved") FROM "by_orbit" WHERE "orbital_regime"='medium earth' AND "successes">3;