N,A,B = map(int,input().split())
XYK = [list(map(int,input().split())) for _ in range(N)]
BN = 1 << N

def dist(a,b):
    return abs(XYK[a][0] - XYK[b][0]) + abs(XYK[a][1] - XYK[b][1])

q = set()
cnt = 1
for i in range(N):
    for j in range(N):
        if i == j:
            continue
        if B <= abs(XYK[i][2]- XYK[j][2]) or A < dist(i,j):
            cnt = 2
            tmp = (1<<i)|(1<<j)
            q.add((i,j,tmp))

Pass = [[[False] * N for _ in range(N)]  for _ in range(N)]
q2 = set()
while q:
    while q:
        abc = next(iter(q))
        q.remove(abc)
        a,b,c = abc
        for i in range(N):
            if i == a or i == b:
                continue
            if c & (1 << i) == 0:
                if B <= abs(XYK[b][2]- XYK[i][2]) or A <= dist(i,a)+dist(i,b):
                    q2.add((b,i,c|(1<<i)))
    if q2:
        cnt += 1
    q,q2 = q2,q

print(cnt)