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 p=0;
        int[] latitude=new int[n];
        int[] longitude=new int[n];
        int[] height=new int[n];
        int[] points=new int[n];
        for(int a0 = 0; a0 < n; a0++){
             latitude[a0] = in.nextInt();
             longitude[a0] = in.nextInt();
             height[a0] = in.nextInt();
             points[a0]= in.nextInt();
        }
        p=points[0];
        int a=0;
          for(int i=1;i<n;i++)
              {
              if((latitude[i]-latitude[a]<=x)&&(longitude[i]-longitude[a]<=y)&&(height[i]>height[a]))
                  {
                  a++;
                  p+=points[i];
              }
          }
        System.out.println(p);
       
    }
}