#include <bits/stdc++.h>

using namespace std;

int main(){
 long long   int n,x,y,sum=0;
    cin >> n >> x >> y;
  int a[1000][1000];
    for(int i=0;i<n;i++){
        for(int j=0;j<4;j++){
            cin>>a[i][j];
        }
    }
    int diff1,diff2;
    for(int i=0;i<n-1;i++){
       
            diff1=abs(a[i][0]-a[i+1][0]);
            diff2= abs(a[i][1]-a[i+1][1]);
            if(diff1<=x&&diff2<=y){
               // cout<<a[i][3];
                sum+=a[i][3];
            }
   
        
    }
     sum+=a[n-1][3];
    cout<<sum<<endl;
    
    return 0;
}