#include <bits/stdc++.h>

using namespace std;
typedef struct
    {
    long long int lat,lon,h,p;
}sett;
int main(){
    long long int n,ans=0;
    long long int x;
    long long int y;
    cin >> n >> x >> y;
    sett s[n],temp;
    for(long long int a0 = 0; a0 < n; a0++){
        cin >> s[a0].lat >> s[a0].lon>> s[a0].h >> s[a0].p;
        // your code goes here
    }
    std::sort(s, s+n, [](sett const &a, sett const &b){ return a.h < b.h; });
    long long int j=0;
    while(s[j].p<0&&j<n)
        j++;
    ans=s[j].p;
    temp=s[j];
    for(long long int i=j+1;i<n;i++)
        {
        if(abs(s[i].lat-temp.lat)<=x&&abs(s[i].lon-temp.lon)<=y&&s[i].p+ans>0)
            {
            temp=s[i];
            ans+=s[i].p;
        }
    }
    cout<<ans;
    return 0;
}