n,x,y = raw_input().strip().split(' ')
n,x,y = [int(n),int(x),int(y)]

A = []
for a0 in xrange(n):
    latitude,longitude,height,points = raw_input().strip().split(' ')
    latitude,longitude,height,points = [int(latitude),int(longitude),int(height),int(points)]
    
    A.append((height, latitude, longitude, points))

A.sort()
ot, og = A[0][1], A[0][2]
P = [0]*n
points = 0
i = 0
while i < n:
    (h, t, g, p) = A[i]
    j = i
    good_p = p
    good_j = j
    while j < n:
        if abs(ot-t) <= x and abs(og-g) <= y and p < 0:
            if p > good_p:
                good_p = p
                good_j = j
            ot, og = A[j][1:3]
            j += 1
        else:
            break
    # print i, j, good_j, good_p, p
    points += good_p
    i = good_j+1
print points