#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; 
    int pointsEarned=0;
    int hgt;
    scanf("%d %d %d",&n,&x,&y);
    
        int latitude[n]; 
        int longitude[n]; 
        int height[n]; 
        int points[n]; 
        
    for(int a0 = 0; a0 < n; a0++){
        scanf("%d %d %d %d",&latitude[a0],&longitude[a0],&height[a0],&points[a0]);
    }
    hgt = 0;
    for(int i=0;i<n;i++)
        {
        for(int j=0;j<n;j++)
            {
            if(height[i]>height[j])
                {
                int temp = height[i];
                height[i] = height[j];
                height[j] = temp;
                
                temp = latitude[i];
                latitude[i] = latitude[j];
                latitude[j] = temp;
                
                temp = longitude[i];
                longitude[i] = longitude[j];
                longitude[j] = temp;
                
                temp = points[i];
                points[i] = points[j];
                points[j] = temp;
            }
        }
    }
    for(int i=0;i<n;i++)
        {
        if(i!=n-1)
            {
        if((latitude[i+1]-latitude[i])<=x   && (longitude[i+1]-longitude[i])<=y)
            {
            pointsEarned += points[i];
        }
        }
        else
            pointsEarned += points[i];
    }
    printf("%d",pointsEarned);
    return 0;
}