A 35-year-old patient complains of weakness, excessive sweating, fatigability pain in the right side during breathing, and a fever of 38°C. Objectively, the following is observed: respiratory rate - 28/min, pulse - 100/min. The right half of the chest lags behind during the act of breathing. Voice tremor is not conducted on the right. Percussion detects a dull sound, breathing is weakened. The borders of the heart are shifted to the left. Complete blood count: leukocytes - 12 x 109/L , band neutrophils -13%, lymphocytes 13%, ESR - 38 mm/hour. What is the most likely diagnosis in this case?