import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int x = in.nextInt();
        int y = in.nextInt();
        ArrayList<City> cities = new ArrayList<City>();
        for(int a0 = 0; a0 < n; a0++){
            int latitude = in.nextInt();
            int longitude = in.nextInt();
            int height = in.nextInt();
            int points = in.nextInt();
            // your code goes here
            
            cities.add(new City(latitude,longitude,height,points));
        }
        
        Collections.sort(cities,new CityComparator());
        
        int prev =-1;
        int max_p=0;
        for(int i=0;i<n;i++)
            {
            if(prev==-1)
                {
                while(cities.get(i).p<0)
                    {
                    i++;
                }
                prev =i;
                max_p=cities.get(i).p;
            }
            else
            {
                if(Math.abs(cities.get(i).la-cities.get(prev).la)<=x && Math.abs(cities.get(i).lo-cities.get(prev).lo)<=y)
                    {
                    max_p+=cities.get(i).p;
                    prev=i;
                }
                                     
            }
        }
        
        System.out.println(max_p);
        
    }
}

class City
    {
    public int la;
    public int lo;
    public int h;
    public int p;
    
    public City(int la,int lo,int h,int p)
        {
        this.la=la;
        this.lo=lo;
        this.h=h;
        this.p=p;
    }
        
}

class CityComparator implements Comparator
    {
    public int compare(Object o1,Object o2)
        {
        City c1 = (City)o1;
        City c2 = (City)o2;
        
        if(c1.h<c2.h)
            return -1;
        else if(c1.h==c2.h)
            return 0;
            else 
            return 1;
    }
    
    public boolean equals(Object o1,Object o2)
        {
         City c1 = (City)o1;
        City c2 = (City)o2;
        return (c1.la==c2.la && c1.lo==c2.lo && c1.h==c2.h && c1.p==c2.p); 
    }
}