#!/bin/ruby

n,x,y = gets.strip.split(' ')
n = n.to_i
X = x.to_i
y = y.to_i

arr = []
for a0 in (0..n-1)
    latitude,longitude,height,points = gets.strip.split(' ')
    latitude = latitude.to_i
    longitude = longitude.to_i
    height = height.to_i
    points = points.to_i
    arr << [latitude, longitude,height,points]
    # your code goes here
end

arr.sort!{|a,b| a[2]<=>b[2]}

arr.each_with_index do |x,i| 
    p = x[3]
    prevmax = 0
    i.times do |j|
        if ((arr[j][0]-x[0]).abs <= X && (arr[j][1]-x[1]).abs <= y)
            if arr[j][3] > prevmax
                prevmax = arr[j][3]
            end
        end
    end
    x[3] = p + prevmax
end

res =  arr.max_by{|x| x[3]}

puts res[3]