A 38-year-old man complains of cough with purulent sputum (up to 60-80 ml per 24 hours) and fever of 39°C. He associates his condition with overexposure to cold. Objectively, his pulse is 96/min, rhythmic. Blood pressure 110/60 mm Hg. Examination reveals that the right side of the chest is lagging behind in the process of breathing. Respiratory rate 30/min. Percussion detects local dullness of the sound near the angle of the scapula. Auscultation detects heterogeneous wet crackles and amphoric breathing.What is the most likely diagnosis in this case?