import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static int no;

    static void sort(city c[])
    {
        city temp;
        for (int i=0;i<no;i++)
        {
            for (int j = 1; j < (no - i); j++)
            {
                if (c[j - 1].hei > c[j].hei)
                {
                    temp = c[j - 1];
                    c[j - 1] = c[j];
                    c[j] = temp;
                }
            }
        }
        int poisum=0;
        for (int i=0;i<no;i++)
        {
            poisum=poisum+c[i].poi;
        }
        System.out.print(poisum);


    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int x = in.nextInt();
        int y = in.nextInt();
        city c[]=new city[n];
        no=n;
        //System.out.print(no);
        for(int a0 = 0; a0 < n; a0++){
            //System.out.println(a0);
            int latitude = in.nextInt();
            int longitude = in.nextInt();
            int height = in.nextInt();
            int points = in.nextInt();
            // your code goes here
             c[a0]=new city(latitude,longitude,height,points);
        }
        sort(c);
    }
}
class city
{
    int lat;
    int longi;
    int hei;
    int poi;

    public city(int latitude, int longitude, int height, int points) {
        lat=latitude;
        longi=longitude;
        hei=height;
        poi=points;
    }
}