using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
        string[] tokens_n = Console.ReadLine().Split(' ');
        int n = Convert.ToInt32(tokens_n[0]);
        int x = Convert.ToInt32(tokens_n[1]);
        int y = Convert.ToInt32(tokens_n[2]);
        
        var cities = new City[n];
        for(int a0 = 0; a0 < n; a0++){
            string[] tokens_latitude = Console.ReadLine().Split(' ');
            int latitude = Convert.ToInt32(tokens_latitude[0]);
            int longitude = Convert.ToInt32(tokens_latitude[1]);
            int height = Convert.ToInt32(tokens_latitude[2]);
            int points = Convert.ToInt32(tokens_latitude[3]);
            cities[a0] = new City(latitude, longitude, height, points);
        }
        
        Array.Sort(cities, new HeightSort());
        int totalPoints = 0;
        City last = null;
        for(int i = 0; i < n; i++){
            var curr = cities[i];
            if(i == 0 ||
              (Math.Abs(curr.lat - last.lat) >= x && Math.Abs(curr.lg - last.lg) >= y)){
                totalPoints += curr.points;
            }    
            last == curr;
            
        }
        Console.WriteLine(totalPoints);
    }
}

public class City{
    public int lat;
    public int lg;
    public int height;
    public int points;
    
    public City(int lat, int lg, int h, int p){
        this.lat = lat;
        this.lg = lg;
        this.height = h;
        this.points = p;
    }
}

public class HeightSort : IComparer<City>{
    public int Compare(City x, City y){
        return x.height.CompareTo(y.height);
    }
}