#include <string.h>
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
template <typename T> using vc = vector<T>;
template <typename T> using vvc = vector<vector<T>>;
template <class S> using pq = priority_queue<S,vector<S>,greater<S>>;
template <class S,class T> inline bool chmax(S &a,const T&b) { return (a < b)?a=b,1:0; }
template <class S,class T> inline bool chmin(S &a,const T&b) { return (a > b)?a=b,1:0; }
#define overlord3(_a,_b,_c,_d,name,...) name
#define REP1(i,n) for(ll i = 0; i < (n); i++)
#define REP2(i,a,b) for(ll i = (a); i < (b); i++)
#define REP3(i,a,b,c) for(ll i = (a); i < (b); i += (c))
#define rep(...) overlord3(__VA_ARGS__,REP3,REP2,REP1)(__VA_ARGS__)
#define PER1(i,n) for(ll i = (n)-1; i >= 0; i--)
#define PER2(i,a,b) for(ll i = (a)-1; i >= b; i--)
#define PER3(i,a,b,c) for(ll i = (a)-1; i >= b; i -= c)
#define per(...) overlord3(__VA_ARGS__,PER3,PER2,PER1)(__VA_ARGS__)
#define fi first
#define se second
#define pb push_back
#define si(c) (int)(c).size()
#define all(c) c.begin(),c.end()
#define lb(c,x) distance((c).begin(),lower_bound(all(c),x))
#define ub(c,x) distance((c).begin(),upper_bound(all(c),x))
#define SORT(c) sort(all(c))
#define REV(c) reverse(all(c))
#define UNIQUE(c) SORT(c),c.erase(unique(all(c)),c.end())
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int N;
cin >> N;
vc<int>X(N),Y(N),W(N);
rep(i,N) {
cin >> X[i] >> Y[i] >> W[i];
}
assert(N <= 100);
vc<pii>res;
rep(i,N) {
res.pb({X[i],W[i]});
}
SORT(res);
ll ans = 0;
rep(i,N) {
ll sum = 0;
rep(j,i,N) {
sum += res[j].se;
chmax(ans,sum);
}
}
cout << ans << "\n";
}
