import sys
import math
N, K = map(int, sys.stdin.readline().rstrip().split())
H = list(map(int, sys.stdin.readline().rstrip().split()))
K = K*K
zahyo = []
for i in range(N):
    x, y = map(int, sys.stdin.readline().rstrip().split())
    zahyo.append((x, y))

dist = [[-1] * (N) for _ in range(N)]
for i in range(N):
    dist[i][i] = 0
    for j in range(i+1, N):
        xi, yi = zahyo[i]
        xj, yj = zahyo[j]
        memo = (xi - xj)**2 + (yi - yj)**2
        dist[i][j] = memo
        dist[j][i] = memo

H2 = []
for i, h in enumerate(H):
    H2.append((h, i))
H2.sort() # 歴史の浅い神社順

cnt = 0
for i in range(N):
    hi, jinja_i = H2[i]
    for j in range(i + 1, N):
        # 神社i を消してくれる 神社はいませんか？
        hj, jinja_j = H2[j]

        if hi < hj and dist[jinja_i][jinja_j] <= K:
            cnt += 1
            break # 削除完了

ans = N - cnt
print(ans)