#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    long int n,x,y,i,count=0,q,w,e,r;
    cin>>n>>x>>y;
    vector<long int>a(n);
    vector<long int>b(n);
    vector<long int>c(n);
    vector<long int>d(n);
    for(i=0;i<n;i++)
    {
      cin>>q>>w>>e>>r;
      a[i] = q;
      b[i] = w;
      c[i] = e;
      d[i] = r;
    }
    
    for(i=0;i<n;i++)
    {
     // if(c[i+1]>c[i] && abs(a[i+1]-a[i])<=x && abs(b[i+1]-b[i])<=y)
     // {
        count = count + d[i];  
      //}
    }
    cout<<count<<endl;
    return 0;
}