A 55 year-old male with history of hepatic cirrhosis is brought to the ED for altered mental status. His vitals are T 100.2, HR 74, BP 113/72, SpO2 96%, RR 18. He is alert but mildly confused. He has a distended abdomen and has no abdominal tenderness but reports some vague abdominal pain. You peform a paracentesis to analyze this patient's ascitic fluid. At what ascitic fluid cell count is spontaneous bacterial peritonitis (SBP) confirmed?