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);
        List<Point> pts = new ArrayList<>();
        int n = in.nextInt();
        int x = in.nextInt();
        int y = in.nextInt();
        for(int a0 = 0; a0 < n; a0++){
            int latitude = in.nextInt();
            int longitude = in.nextInt();
            int height = in.nextInt();
            int points = in.nextInt();
            pts.add(new Point(latitude, longitude, height, points));
        }
        Collections.sort(pts); 
        
        int maxPts = 0;
        for (int i=0; i<pts.size()-1; i++) {
            int currLat = pts.get(i).lat;
            int currLong = pts.get(i).lon;
            int currPts = pts.get(i).p;
            for (int j=i+1; j<pts.size(); j++) {
                Point c = pts.get(j);
                if (Math.abs(currLat - c.lat) > x ||
                        Math.abs(currLong - c.lon) > y)
                    continue;
                currPts += c.p;
                currLat = c.lat;
                currLong = c.lon;
            }
            if ( currPts > maxPts)
                maxPts = currPts;
        }
        
        System.out.println(maxPts);
    }
    
    public static class Point implements Comparable<Point>{
        public Point(int latitude, int longitude, int height, int points) {
            lat = latitude;
            lon = longitude;
            h = height;
            p = points;
        }
        
        int lat;
        int lon;
        int h;
        int p;
        
        @Override
        public int compareTo(Point o) {
            return Integer.compare(h, o.h);
        }
    }
}