A 20-year-old patient complains of severe headache, double vision, weakness, fever, irritability. Objectively: body temperature is at the rate of 38,1°C, the patient is reluctant to contact, sensitive to stimuli. There is ptosis of the left eyelid, exotropia, anisocoria S>D, pronounced meningeal syndrome. On lumbar puncture the cerebrospinal fluid flowed out under a pressure of 300 mm Hg, the fluid is clear, slightly opalescent. 24 hours later there appeared the fibrinous film. Protein - 1,4 g/l, lymphocytes - 600/3 per mm3, sugar - 0,3 mmol/l. What is the provisional diagnosis?