#!/bin/python3

import sys

n,x,y = input().strip().split(' ')
n,x,y = [int(n),int(x),int(y)]
matrix = []
for a0 in range(n):
    latitude,longitude,height,points = input().strip().split(' ')
    latitude,longitude,height,points = [int(latitude),int(longitude),int(height),int(points)]
    # your code goes here
    matrix.append([latitude,longitude,height,points])

a = sorted(matrix,key=lambda x: x[2])
count = a[0][3]
latitude = a[0][0]
longi = a[0][1]
for i in range(1,len(a)):
    if abs(latitude-a[i][0]) <= x and abs(longi-a[i][1]) <= y:
        count = count + a[i][3]
        latitude = a[i][0]
        longi = a[i][1]
print(count)