#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std;
const int MAX_N=2e2+2;
int n;
long long x[MAX_N];
long long y[MAX_N];
long long cost[MAX_N];
vector<pair<long long,int>>order;
long long distance(long long A,long long B,long long C,long long x0,long long y0)
{
return A*x0+B*y0+C;
}
long long solvefor()
{
long long curbest=0;
for(int i=0;i<order.size();i++)
{
long long cur=0;
for(int j=i;j<order.size();j++)
{
cur+=cost[order[j].second];
curbest=max(curbest,cur);
}
}
return curbest;
}
void solve()
{
for(int i=1;i<=n;i++)
{
order.push_back({x[i],i});
}
sort(order.begin(),order.end());
long long ans=max(0LL,solvefor());
cout<<ans<<"\n";
}
int main ()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>x[i]>>y[i]>>cost[i];
}
solve();
return 0;
}
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