#include <bits/stdc++.h>

typedef long long int ll;
typedef unsigned long long int ull;
typedef long double ld;

#define mp make_pair
#define pb push_back
#define bp __builtin_popcount

#define mt(a,b,c) mp(a,mp(b,c))

const ll mo=1e9+7;
const ll INF=1e9;
const ld pi=acos(-1);
const int mxn=1e3+5;
const int cons=1;

using namespace std;

int la[mxn],lo[mxn],ht[mxn],pt[mxn];
ll dp[mxn][mxn];
int n,x,y;

ll rec(int ind,int prev)
{
    //cout<<ind<<" "<<prev<<"\n";
    if(ind==n+1)
    {
        return 0;
    }
    if(dp[ind][prev]!=-1)
    {
        return dp[ind][prev];
    }
    ll ans=rec(ind+1,prev);
    if(ht[ind]>ht[prev])
    {
        if(abs(la[ind]-la[prev])<=x)
        {
            if(abs(lo[ind]-lo[prev])<=y)
            {
                ans=max(ans,pt[ind]+rec(ind+1,ind));
            }
        }
    }
    return dp[ind][prev]=ans;
}

int main()
{
    //freopen("input.txt","r",stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    memset(dp,-1,sizeof(dp));
    int i;
    cin>>n>>x>>y;
    for(i=1;i<=n;i++)
    {
        cin>>la[i]>>lo[i]>>ht[i]>>pt[i];
    }
    la[0]=la[1];
    lo[0]=lo[1];
    cout<<rec(1,0);
    return 0;
}