A 38-year-old man was delivered to the hospital in unconscious state. The symptoms of illness turned up a day before: headache, nausea, vomiting, to-38,5°C, dizziness, delusion. For the last 4 days he had been complaining of pain and hearing loss in the left ear. Objectively: sopor, rigidity of occipital muscles, bilateral Kernig's symptom, general hyperesthesia, purulent discharges from the left ear. What is the most probable diagnosis?