n, x, y = map(int, input().split())
cit = [tuple(map(int, input().split())) for _ in range(n)]
cit.sort(key = lambda x:x[2])
p = [float('-inf')]*n
p[n-1] = cit[n-1][3]
for i in range(n-2,-1,-1):
	p[i] = cit[i][3]
	for j in range(i+1,n):
		if abs(cit[j][0]-cit[i][0]) <= x and abs(cit[j][1]-cit[i][1]) <= y:
			p[i] = max(p[i], cit[i][3]+p[j])
x = max(p)
if x == float('-inf'):
	max()
else:
	print(x)