Among the courses that are basic or medium undergraduate courses, how many of them are taught by a faculty member?
courses that are basic or medium undergraduate courses refers to courseLevel = 'Level_300'; faculty member refers to hasPosition ! = 0
SELECT COUNT(*) FROM course AS T1 INNER JOIN taughtBy AS T2 ON T1.course_id = T2.course_id INNER JOIN person AS T3 ON T2.p_id = T3.p_id WHERE T3.professor = 1 AND T1.courseLevel = 'Level_300'