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();
        long sum = 0;
		int lastLatitude = 0, lastLongitude = 0, lastHeight = 0;
        int[][] arr = new int[n][];
        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
            arr[a0] = new int[]{latitude,longitude,height,points};
        }
        
        for (int i = 0; i < arr.length; i++) {
			for (int j = i; j > 0; j--) {
				if (arr[j - 1][2] > arr[j][2]) {
					int[] tmp = arr[j - 1];
					arr[j - 1] = arr[j];
					arr[j] = tmp;
				}
			}
		}
        
        for(int a0 = 0; a0 < n; a0++){
            int latitude = arr[a0][0];
            int longitude = arr[a0][1];
            int height = arr[a0][2];
            int points = arr[a0][3];
            // your code goes here
            if (a0 == 0 || (height > lastHeight && Math.abs(latitude - lastLatitude) <= x
					&& Math.abs(longitude - lastLongitude) <= y)) {
				sum += points;
				lastLatitude = latitude;
				lastLongitude = longitude;
				lastHeight = height;
			}
        }
        
        System.out.println(sum);
    }
}