#include <bits/stdc++.h>

using namespace std;
/*class cage
    {
    public:
    int latitude;
        int longitude;
        int height;
        int points;
}*/

int main(){
    int n;
    int x;
    int y;
    int la,lo,h,p;
    int sum=0;
    cin >> n >> x >> y;
    //cage a[10];
    for(int i = 0; i < n; i++){
        int latitude;
        int longitude;
        int height;
        int points;
        cin >> latitude >> longitude >> height >> points;
        
        // your code goes here
        if(i==0)
            sum=sum+points;
        else
            {
            if(height>h && abs(la-latitude)<=x && abs(lo-longitude)<=y)
                sum=sum+points;
        }
        la=latitude;
        lo=longitude;
        h=height;
        //p=points;
        /*if(i==0)
            sum=sum+p;*/
        
    }
    cout<<sum;
    return 0;
}