#!/bin/python

import sys


n,x,y = raw_input().strip().split(' ')
n,x,y = [int(n),int(x),int(y)]
latitude=[]
longitude=[]
height=[]
points=[]
flag=[]
for a0 in xrange(n):
    la,lo,h,p = raw_input().strip().split(' ')
    la,lo,h,p = [int(la),int(lo),int(h),int(p)]
    latitude.append(la)
    longitude.append(lo)
    height.append(h)
    points.append(p)
for i in range(0,n):
    flag.append(1)
    for j in range(i+1,n):
        if(height[i]>height[j]):
            temp=height[i]
            height[i]=height[j]
            height[j]=temp
            temp=latitude[i]
            latitude[i]=latitude[j]
            latitude[j]=temp
            temp=longitude[i]
            longitude[i]=longitude[j]
            longitude[j]=temp
            temp=points[i]
            points[i]=points[j]
            points[j]=temp
sum1=points[0]
for i in range(0,n):
    for j in range(i+1,n):
        if(flag[j]==1 and abs(latitude[i]-latitude[j])<=x and abs(longitude[i]-longitude[j])<=y):
            sum1+=points[j]
            flag[j]=0
print sum1
    # your code goes here