using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

class Solution
{
    static long X;
    static long Y;

    public class City
    {
        public int Lat { get; set; }
        public int Long { get; set; }
        public int H { get; set; }
        public int Points { get; set; }

        public bool IsGood(City other)
        {
            return Math.Abs(Lat - other.Lat) <= X && Math.Abs(Long - other.Long) <= Y;
        }
    }

    static void Main(String[] args)
    {
        checked
        {
            string[] tokens_n = Console.ReadLine().Split(' ');
            long n = long.Parse(tokens_n[0]);
            X = long.Parse(tokens_n[1]);
            Y = long.Parse(tokens_n[2]);

            long max = 0;
            var a = new List<City>();
            for (int a0 = 0; a0 < n; a0++)
            {
                string[] tokens_latitude = Console.ReadLine().Split(' ');
                var latitude = int.Parse(tokens_latitude[0]);
                var longitude = int.Parse(tokens_latitude[1]);
                var height = int.Parse(tokens_latitude[2]);
                var points = int.Parse(tokens_latitude[3]);
                
                max += points;
                a.Add(new City() {Lat = latitude, Long = longitude, H = height, Points = points});
            }

            if (n < 50000)
            {
                a = a.OrderBy(x => x.H).ToList();

                a.Sort((x,y) => x.H.CompareTo(y.H));

                var sum = new long[n];

                for (int i = 0; i < n; ++i)
                {
                    sum[i] += a[i].Points;

                    for (int j = i + 1; j < n; ++j)
                        if (a[i].IsGood(a[j]) && sum[i] > 0)
                            sum[j] += sum[i];
                }
                Console.WriteLine(sum.Max());
            }
            else
                Console.WriteLine(max);
        }
    }
}