import sys
mod = 998244353
mod2 = 10**9+7

N, K = map(int, input().split())
K = K**2
H = list(map(int, input().split()))
shrines = []
for i in range(N):
    x, y = map(int, input().split())
    shrines.append((H[i], x, y))
shrines.sort()
ans = N
for i in range(N-1):
    for j in range(i+1, N):
        if H[i] == H[j]:continue
        dx, dy = shrines[i][1] - shrines[j][1], shrines[i][2] - shrines[j][2]
        dx, dy = abs(dx), abs(dy)
        if dx**2+dy**2 <= K:
            ans -= 1
            break
print(ans)