#include <bits/stdc++.h>
using namespace std;
#define s second 
#define f first 
long Abs(long n)
    {
    return n>0?n:(-n);
}
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    ios_base::sync_with_stdio(0);
   vector<pair<int,int> >  h;
    int n,x,y;
    cin>>n>>x>>y;
   
    int L[n],p[n],l[n];
    for(int i=0;i<n;i++)
    {
        int l0,L0,h0,P0;
        cin>>l0>>L0>>h0>>P0;
        l[i]=l0;
        L[i]=L0;
        p[i]=P0;
            
        h.push_back(make_pair(h0,i));
    }
    sort(h.begin(),h.end());
    long ans=0,ind=h[0].s;
    for(int i=0;i<n;i++)
     {
         if(Abs(l[h[i].s]-l[ind])<=x && Abs(L[h[i].s]-L[ind])<=y)
             {
             ans+=p[h[i].s];
             ind=h[i].s;
         }
    }
    cout<<ans;
    return 0;
}