#!/bin/python3

import sys


n,x,y = input().strip().split(' ')
n,x,y = [int(n),int(x),int(y)]
city=[]
for a0 in range(n):
    latitude,longitude,height,points = input().strip().split(' ')
    t = [int(height),int(latitude),int(longitude),int(points)]
    city.append(t)
    # your code goes here
city.sort()
#print(city)
res=city[0][3]
for i in range(1,n):
    if abs(city[i][1]-city[i-1][1])<=x and abs(city[i][2]-city[i-1][2])<=y:
        res+=city[i][3]
print(res)