import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class App {

    public static void main(String args[]) {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

        try {
            String[] initial = bufferedReader.readLine().split(" ");
            if (initial.length == 3) {
                int n = Integer.valueOf(initial[0]);
                City[] cities = new City[n];
                int x = Integer.valueOf(initial[1]);
                int y = Integer.valueOf(initial[2]);
                for (int i = 0; i < n; i++) {
                    String[] temp = bufferedReader.readLine().split(" ");
                    if (temp.length == 4) {
                        cities[i] = new City(Integer.valueOf(temp[0]), Integer.valueOf(temp[1]), Integer.valueOf(temp[2]), Integer.valueOf(temp[3]));
                    }
                }
                Arrays.sort(cities);
                int totalPoint = 0;
                for (int i = 0; i < cities.length; i++) {
                    int j = i + 1;
                    if (j <= cities.length - 1) {
                        if ((cities[i].getLatitude() - cities[j].getLatitude() <= x) && (cities[i].getLongitude() - cities[j].getLongitude() <= y)) {
                            totalPoint += cities[i].getPoint();
                        }
                    }
                }
                if ((cities[cities.length - 1].getLatitude() - cities[cities.length - 2].getLatitude() <= x) && (cities[cities.length - 1].getLongitude() - cities[cities.length - 2].getLongitude() <= y)) {
                    totalPoint += cities[cities.length - 1].getPoint();
                }
                System.out.println(totalPoint);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }


    }

}

class City implements Comparable<City> {
    int latitude;
    int longitude;
    int height;
    int point;

    City(int latitude, int longitude, int height, int point) {
        this.latitude = latitude;
        this.longitude = longitude;
        this.height = height;
        this.point = point;
    }

    int getLatitude() {
        return latitude;
    }

    int getLongitude() {
        return longitude;
    }

    private int getHeight() {
        return height;
    }

    int getPoint() {
        return point;
    }

    public void setPoint(int point) {
        this.point = point;
    }

    @Override
    public int compareTo(City o) {
        int compareHeight = o.getHeight();
        return this.height - compareHeight;
    }

    @Override
    public String toString() {
        return "City{" +
                "latitude=" + latitude +
                ", longitude=" + longitude +
                ", height=" + height +
                ", point=" + point +
                '}';
    }
}