A 34-year-old woman is admitted with a history of fever, chills, and greenish sputum for 10 days. She has history of ETOH and substance abuse. On physical examination, vital signs are: pulse 113 bpm; temperature 101degF; respirations 25/min; blood pressure 110/78 mm Hg. She looks ill and has crackles with egophony and E to A changes in the right upper lung field. Laboratory data: Hb 12 g/dL; Hct 37%; WBCs 15.0/uL; differential BUN 48 mg/dL; creatinine 1.7 mg/dL. Chest radiographs are shown below.What is the most likely diagnosis?