#include <bits/stdc++.h>

using namespace std;
struct S{
    long lat,lon,point,in,h;
};
bool compp(S a,S b){
    return a.h>b.h;
}

int main(){
    int n;
    int x;
    int y;
    cin >> n >> x >> y;
    S s[n];
    for(int i=0;i<n;i++){
        s[i].in=i;
        cin>>s[i].lat>>s[i].lon>>s[i].h>>s[i].point;
    }
    sort(s,s+n,compp);
   // sort(s,s+n,comph);
    long long ans=s[0].point;
    //cout<<s[0].in<<" ";
    long temph=s[0].h,templat=s[0].lat,templon=s[0].lon;
    for(int i=1;i<n;i++){
       // cout<<s[i].h<<" ";
        if(s[i].h<temph){
            if(abs(s[i].lat-templat)<=x){
                if(abs(s[i].lon-templon)<=y){
                    if(s[i].point>=0){
                    ans+=s[i].point;
                    temph=s[i].h;
                    //cout<<s[i].in<<" ";
                    templat=s[i].lat;
                        templon=s[i].lon;}
                }
            }
        }
    }
    cout<<ans;
    return 0;
}