#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    int x;
    int y;
    cin >> n >> x >> y;
    long total=0;
    int lat,lon,h;
    for(int a0 = 0; a0 < n; a0++){
        int latitude;
        int longitude;
        int height;
        int points;
        cin >> latitude >> longitude >> height >> points;
        // your code goes here
        if(a0==0){
            total += points;
        }
        else{
            if(height>h){
                if((abs(lat-latitude)<=x) && (abs(lon-longitude)<=y)){
                    total +=points;
                }
            }
            
        }
        lat = latitude;
        lon = longitude;
        h = height;
    }
    cout<<total;
    return 0;
}