#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
ll n;
ll x,y,w;
map<ll,ll> M;
vector<ll> V;
cin>>n;
for(ll i=0;i<n;i++){
cin>>x>>y>>w;
M[x]=w;
}
for(auto x:M){
V.push_back(x.second);
}
ll ans=0;
ll s=0;
for(ll i=0;i<V.size();i++){
if(s+V[i]>0){
s+=V[i];
}else{
s=0;
}
ans=max(ans,s);
}
cout<<ans;
}
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