#include<bits/stdc++.h>
using namespace std; 
#define ll long long int
#define dbl double
#define si set<int>
#define vi vector<int>
#define vii vector<string>
#define mii map<int,int>
#define pii pair<int,int>
#define vpii vector<pii>
#define pll pair<ll,ll>
#define pff pair<double,double>
#define fr(i,n) for(int i=0;i<n;i++)
#define mxx 100001
#define mmm 201
#define mymod 1000000007
#define pcal 1e-5
int main()
{
    clock_t tstart = clock();
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    //cout<<fixed<<setprecision(2);
    int n,x,y;
    cin>>n>>x>>y;
    vi lati(n);
    vi longi(n);
    vpii height(n);
    int points[n];
    fr(i,n)
    {
      int x;
      cin>>lati[i];
      cin>>longi[i];
      cin>>x;
      height[i] = make_pair(x,i);
      cin>>points[i];
    }
    sort(height.begin(),height.end());
    ll ans = 0;
    ll t0 = 0;
    int prev = -1;
    fr(i,n)
    {
      int ind = height[i].second;
      if(prev==-1)
      {
        prev = ind;
        ans += points[ind];
        ans = max(ans,t0);
        continue;
      }
      if(abs(lati[ind]-lati[prev])>x || abs(longi[ind]-longi[prev])>y)
      {
        prev = ind;
        continue;
      }
      ans += (ll)points[ind];
      ans = max(ans,t0);
      prev = ind;
    }
    ans = max(ans,t0);
    cout<<ans;
   // cout<<"\n\nTotal Time Taken : "<<(double)(-tstart + clock())/CLOCKS_PER_SEC<<"sec\n\n";
    return 0;
}