#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
double ptLineDist(double x1, double y1, double x2, double y2, double px, double py){
double pd2 = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
double x, y;
if(pd2 == 0){
x = x1;
y = y2;
}
else{
double u = ((px-x1) * (x2 - x1) + (py - y1) * (y2-y1)) / pd2;
x = x1 + u * (x2 - x1);
y = y1 + u * (y2 - y1);
}
return (x-px) * (x - px) + (y - py) * (y - py);
}
int main(){
int n;
cin >> n;
ll ans = 0LL;
ll x[n];
ll y[n];
ll v[n];
for(int i = 0; i<n; i++){
cin >> x[i] >> y[i] >> v[i];
}
for(int i = 0; i<n; i++){
ans = max(ans,v[i]);
for(int j = i+1; j<n; j++){
vector<pair<double, ll> > li;
for(int k = 0; k<n; k++){
bool cross = (y[k]-y[j])*(x[j]-x[i]) > (y[j]-y[i])*(x[k]-x[j]);
double dist = ptLineDist(x[i], y[i], x[j], y[j], x[k], y[k]);
if(cross){
li.push_back(make_pair(dist,v[k]));
}
else{
li.push_back(make_pair(-dist,v[k]));
}
}
sort(li.begin(),li.end());
ll bestPre = 0LL;
ll cur = 0LL;
double tol = 1e-7;
for(int k = 0; k<n; k++){
if(k>0 && li[k].first-li[k-1].first>tol){
bestPre = min(bestPre,cur);
}
cur += li[k].second;
if(k==n-1 || li[k+1].first-li[k].first>tol){
ans = max(ans,cur-bestPre);
}
}
}
}
cout << ans << endl;
}
