A 52-year-old man from Delhi presents to the ophthalmology clinic with blurred vision for 2 weeks. He has a 10-year history of uncontrolled hypertension (currently BP 180/115 mmHg). On fundoscopy, you observe flame-shaped hemorrhages in the retina, cotton-wool spots, hard exudates arranged in a macular star pattern, and papilledema. The optic disc appears swollen. What is the Keith-Wagener-Barker grade of hypertensive retinopathy in this patient?