#include <bits/stdc++.h>
using namespace std;
const int MN = 2e3 + 5;
#define lc ind<<1
#define rc ind<<1|1
struct Node {
long long mn,mx;
} tree[MN<<2];
void update (int ind, int tl, int tr, int i, long long v) {
if (tl == tr) {
tree[ind].mx += v; tree[ind].mn += v;
return;
}
int mid = (tl + tr) / 2;
if (i <= mid) update(lc,tl,mid,i,v);
else update(rc,mid+1,tr,i,v);
tree[ind].mn = min(tree[lc].mn,tree[rc].mn);
tree[ind].mx = max(tree[lc].mx,tree[rc].mx);
}
long long queryMin (int ind, int tl, int tr, int l, int r) {
if (tl > r || tr < l) return LLONG_MAX;
if (l <= tl && tr <= r) return tree[ind].mn;
int mid = (tl + tr) / 2;
return min(queryMin(lc,tl,mid,l,r),queryMin(rc,mid+1,tr,l,r));
}
long long queryMax (int ind, int tl, int tr, int l, int r) {
if (tl > r || tr < l) return LLONG_MIN;
if (l <= tl && tr <= r) return tree[ind].mx;
int mid = (tl + tr) / 2;
return max(queryMax(lc,tl,mid,l,r),queryMax(rc,mid+1,tr,l,r));
}
int main () {
int n,c=0; scanf ("%d",&n);
vector<array<int,4>> pts(n); vector<int> pos(n), ow(n);
vector<long long> vAt(n+1);
for (auto &[x,y,w,id] : pts) scanf ("%d %d %d",&x,&y,&w), id=c++, ow[id] = w;
vector<array<int,4>> events;
for (int i = 0; i < n; i++) {
for (int j = i+1; j < n; j++) {
int dx = pts[i][0] - pts[j][0], dy = pts[i][1] - pts[j][1];
if (dx < 0) dx = -dx, dy = -dy;
if (dx == 0 && dy < 0) dy = -dy;
events.push_back({dx,dy,i,j});
}
}
sort(pts.begin(),pts.end());
sort(events.begin(),events.end(),[&](const auto &a, const auto &b) {return (long long)a[1] * b[0] > (long long)b[1] * a[0];});
long long ret = 0, pre = 0;
for (int i = 0; i < n; i++) {
pos[pts[i][3]] = i+1; ret = max(ret,(long long)pts[i][2]);
pre += pts[i][2]; vAt[i+1] = pre;
update(1,1,n,i+1,pre);
}
for (auto &[x,y,i,j] : events) {
if (pos[i] > pos[j]) swap(i,j);
ret = max(ret,vAt[pos[j]] - min(0LL,queryMin(1,1,n,1,pos[i]-1)) - min(0,ow[i]) - min(0,ow[j]));
ret = max(ret,queryMax(1,1,n,pos[j],n) - (pos[i] == 1 ? 0LL : vAt[pos[i]-1]) - min(0,ow[i]) - min(0,ow[j]));
update(1,1,n,pos[i],ow[j]-ow[i]); vAt[pos[i]] += ow[j] - ow[i];
swap(pos[i],pos[j]);
}
printf ("%lld\n",ret);
return 0;
}
