#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    int x;
    int y;
    cin >> n >> x >> y;
    int arr[n][5];
    
        int latitude;
        int longitude;
        int height;
        int points;
        cin >> latitude >> longitude >> height >> points;
         long long sum=0;
        for(int i=1;i<n;i++)
        {
        	int a,b,c,d;
        	cin>>a>>b>>c>>d;
        	if(c>height)
        	{
        		int diff= latitude-a;
        		int diff1,diff2;
        		diff1 = abs(longitude-b);
        		if(diff<=x && diff1<=y) 
        		{
				sum+= (points+d);
        		latitude = a;
        		longitude= b;
        		height= c;
        		points=0; 
        	    }
			}
			else 
			{
				continue;
	
			}
		}
		cout<<sum;
    return 0;
}