#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    int n; 
    int x; 
    int y,sum=0; 
    int k[100000],m[10000],z[10000];
    scanf("%d %d %d",&n,&x,&y);
    for(int a0 = 0; a0 < n; a0++){
        int latitude; 
        int longitude; 
        int height; 
        int points; 
        scanf("%d %d %d %d",&latitude,&longitude,&height,&points);
        k[a0]=points;
        m[a0]=latitude;
        z[a0]=longitude;
    }
     for(int a0 = 0; a0 < n; a0++)
         {
         if(a0<n-1)
             {
        if((m[a0+1]-m[a0])<=x&&(z[a0+1]-z[a0])<=y)
            {
                  
                      sum=sum+k[a0];
        }

         }
         
         else
             sum=sum+k[n-1];
    }
   
    printf("%d\n",sum);
}