N,A,B=map(int,input().split())
XYK=[list(map(int,input().split())) for _ in range(N)]
dist = [[0]*N for _ in range(N)]
distK = [[0]*N for _ in range(N)]
for i in range(N):
    x1,y1,k1 = XYK[i]
    for j in range(N):
        x2,y2,k2 = XYK[j]
        dist[i][j] = dist[j][i] = abs(x1-x2)+abs(y1-y2)
        distK[i][j] = distK[j][i] = abs(k2-k1)
visit = [0]*N
def dfs(route:list):
    ret = len(route)
    for i in range(N):
        if visit[i]:continue
        i0,i1 = route[-2:]
        flg=0
        if distK[i1][i]>=B:
            flg=1
        else:
            if A<=dist[i][i1]+dist[i][i0]:
                flg=1
        if flg:
            route.append(i)
            visit[i]=1
            ret2 = dfs(route)
            visit[i]=0
            route.pop()
            ret = max(ret, ret2)
    if ret==N:
        print(N)
        exit()
    return ret

def solve():
    ret = 1
    route = []
    for i in range(N):
        route.append(i)
        visit[i]=1
        for j in range(N):
            if i==j:continue
            if A<=dist[i][j] or B<=distK[i][j]:
                if ret==1:ret=2
                route.append(j)
                visit[j]=1
                ret2 = dfs(route)
                ret = max(ret, ret2)
                route.pop()
                visit[j]=0
        visit[i]=0
        route.pop()

    return ret
print(solve())