import math
N,K=map(int,input().split())
H=list(map(int,input().split()))
XY=[]
for _ in range(N):
    x,y=map(int,input().split())
    XY.append((x,y))
S=[]
for i in range(N):
    S.append((H[i],XY[i]))
S.sort()
ans=N
for i in range(N-1):
    hi,(xi,yi)=S[i]
    destroy=0
    for j in range(i+1,N):
        hj,(xj,yj)=S[j]
        if hi<hj and math.sqrt((xi-xj)**2+(yi-yj)**2)<=K:
            destroy=1
    ans-=destroy
print(ans)