A 30-year-old man complains of pain in the lower legs of both legs, which worsens over time walk. The patient is forced to stop after 150-200 m. Intermittent claudication appeared a year therefore, the distance between stops was reduced. Both feet are pale, cool. Pulse on posterior arteries of the feet are absent. The skin is dry, hyperkeratosis on the soles, nails are thickened, easily breakable, matte color. On the legs - areas of alopecia. What stage obliterating endarteritis in this patient?