Name the number of outgoing manager for rijeka
CREATE TABLE "table1_27225944_3" (
  "team" text,
  "outgoing_manager" text,
  "manner_of_departure" text,
  "date_of_vacancy" text,
  "replaced_by" text,
  "date_of_appointment" text,
  "position_in_table" text
);
SELECT COUNT("outgoing_manager") FROM "table1_27225944_3" WHERE "team"='Rijeka';