#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    int x;
    int y;
    cin >> n >> x >> y;
    int lat[n],longi[n],ht[n],pts[n];
    for(int a0 = 0; a0 < n; a0++){
        int latitude;
        int longitude;
        int height;
        int points;
        cin >> latitude >> longitude >> height >> points;
        if(a0==0){
            //cout << "1" << endl;
            ht[0]=height;
            lat[0]=latitude;
            longi[0]=longitude;
            pts[0]=points;       
        }
        else{
                 
        for(int j=a0;j>0;j--){
            if(height<ht[j-1]){
                //cout << "2" << endl;
                int temp;
                temp=ht[j-1];
                ht[j-1]=height;
                ht[a0]=temp;
                temp=lat[j-1];
                lat[j-1]=latitude;
                lat[a0]=temp;
                temp=longi[j-1];
                longi[j-1]=longitude;
                longi[a0]=temp;
                temp=pts[j-1];
                pts[j-1]=points;
                pts[a0]=temp;
            }
            else{
                //cout << "3" << endl;
                ht[a0]=height;
                lat[a0]=latitude;
                longi[a0]=longitude;
                pts[a0]=points;
            }
        }
        }
        
        // your code goes here
    }
    int total=0;
    for(int i=0;i<n;i++){
        if(pts[i]<0 && i==0)
            continue;
        if(pts[i]<0){
            int temp=i;
            while(pts[i]<0)
                i++;
            if(lat[i]-lat[temp-1]<=x){
                if(longi[i]-longi[temp-1]<=y)
                    total+=pts[i];
                else{
                    int t=temp,min;
                    for(int k=temp;k<i-1;k++){
                        if(pts[k]>pts[k+1])
                            min=k;
                        else
                            min=k+1;
                    }                        
                    total+=pts[min];
                    i=min;
                }                    
            }
            else{
                total+=pts[temp];
                i=temp;
            }
        }
        else{
            total+=pts[i];
        }
    }
    cout << total;
    /*for(int i=0;i<n;i++)
            cout << ht[i] << " ";*/
    return 0;
}