CREATE TABLE table_203_293 (id DECIMAL, "years of appearance" TEXT, "title" TEXT, "network" TEXT, "character name" TEXT, "actor" TEXT, "notes" TEXT)

collectively , how many shows did hbo and mtv air ?
SELECT COUNT("title") FROM table_203_293 WHERE "network" IN ('hbo', 'mtv')
SELECT COUNT("title") FROM "table_203_293" WHERE "network" IN ('hbo', 'mtv')