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 sum=0;
        int[] lat=new int[n];
        int[] lon=new int[n];
        int[] h=new int[n];
        int[] points=new int[n];
        for(int a = 0; a < n; a++)
        {
            lat[a] = in.nextInt();
            lon[a] = in.nextInt();
            h[a] = in.nextInt();
            points[a] = in.nextInt();
        }
        for(int i=0;i<n;i++)
        {
            if(i==n-1)
            {
                sum=sum+points[i];
                break;
            }
        if(lat[i]-lat[i+1]<=x && lon[i]-lon[i+1]<=y && h[i]<h[i+1])
        {
            sum=sum+points[i];
        }
            
        }System.out.println(sum);
    }
}