from collections import defaultdict

N, K = map(int, input().split())
H = list(map(int, input().split()))

points = defaultdict(list)
for i in range(N):
	X, Y = map(int, input().split())
	points[H[i]].append((X, Y))

existing = []
for h in sorted(points.keys()):
	reject = set()
	for X, Y in points[h]:
		for i, (x, y) in enumerate(existing):
			if (X - x)**2 + (Y - y)**2 <= K**2:
				reject.add(i)
	
	new_existing = []
	for i, (X, Y) in enumerate(existing):
		if i not in reject:
			new_existing.append((X, Y))
	
	for X, Y in points[h]:
		new_existing.append((X, Y))
	
	existing = new_existing

print(len(existing))