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();
        int totalPoints=0;
        int oldLat=0,oldLong=0,oldHeight=0;
        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
            if(oldHeight<height&& (Math.abs(oldLat-latitude)<=x)&&(Math.abs(oldLong-longitude)<=y))
                {
                totalPoints=totalPoints+points;
                oldLat=latitude;
                oldLong=longitude;
                oldHeight=height;
            }
            
        }
        System.out.print(totalPoints);
    }
}