#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) x.begin(), x.end()
using pint = pair<int, int>;
struct Val {
ll sum, lmx, rmx, mx;
void operator=(int x) { lmx = rmx = mx = max(sum = x, 0ll); }
Val operator+(const Val &o) const {
Val ret{sum + o.sum, max(lmx, sum + o.lmx), max(rmx + o.sum, o.rmx)};
ret.mx = max({mx, o.mx, ret.lmx, ret.rmx, rmx + o.lmx});
return ret;
}
};
struct St {
int n;
vector<Val> st;
St(int n) : n(n), st(n << 1) {}
void update(int i, int v) {
for (st[i += n] = v; i >>= 1;) st[i] = st[i << 1] + st[i << 1 | 1];
}
ll query(int l, int r) {
Val lagg{}, ragg{};
for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
if (l & 1) lagg = lagg + st[l++];
if (r & 1) ragg = st[--r] + ragg;
}
return (lagg + ragg).mx;
}
};
pint operator-(const pint &a, const pint &b) { return {a.first - b.first, a.second - b.second}; }
ll operator^(const pint &a, const pint &b) { return (ll) a.first * b.second - (ll) b.first * a.second; }
int main() {
int n;
cin >> n;
pint p[n];
int w[n];
for (int i = n; i--;) cin >> p[i].first >> p[i].second >> w[i];
int arr[n];
iota(arr, arr + n, 0);
sort(arr, arr + n, [&] (int i, int j) { return p[i] < p[j]; });
St st(n);
int idx[n];
for (int i = n; i--;) st.update(idx[arr[i]] = i, w[arr[i]]);
vector<pair<pint, pint>> swaps;
for (int i = n; i--;) {
for (int j = n; j--;) {
pint v = p[i] - p[j];
if (v > pint{0, 0}) swaps.emplace_back(v, pint{i, j});
}
}
sort(all(swaps), [&] (auto &a, auto &b) { return (a.first ^ b.first) < 0; });
ll ans = st.query(0, n);
for (int i = 0; i < swaps.size(); ++i) {
auto [a, b] = swaps[i].second;
if (idx[a] > idx[b]) {
swap(idx[a], idx[b]);
st.update(idx[a], w[a]);
st.update(idx[b], w[b]);
}
if (i + 1 == swaps.size() or (swaps[i].first ^ swaps[i + 1].first)) ans = max(ans, st.query(0, n));
}
cout << ans;
}
