An 18 y.o. patient was admitted to the hematologic department with complaints of headache, general weakness, poor appetite, body temperature rise up to 39°C, neck swelling. Objectively: skin and mucous membranes are extremely pale, lymph nodes on the both sides of neck are up to 1 cm large, painless. Liver is enlarged 1 cm, painless, spleen 0,5 cm, t- 38°C. Blood count: Hb- 98g/L, RBC-2,9 × 1012/l, leukocytes - 32 × 109/l, stab neutrophils - 0%, segmental leukocytes - 28%, monocytes - 2%, lymphocytes -39%, blasts - 31%, reticulocytes - 31%, thrombocytes - 120* 109/l, ESR - 36 mm/h. What form of leukosis does the patient have?