#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<string>
#include<cstring>
#include<algorithm>
#include<sstream>
#include<complex>
#include<functional>
#include<vector>
#include<map>
#include<queue>
#include<deque>
#include<stack>
#include<set>

using namespace std;
#define endl '\n'
#define pb push_back
#define fst first
#define scd second
#define EPS (1e-7)
#define INF (1e9)
#define PI (acos(-1))
#define ALL(x) (x).begin(), (x).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define REP(i,n) for(int i = 0;i < (n);i++)
#define FOR(i,a,b) for(int i = (a);i <= (b);i++)
#define YES(n) cout << ((n) ? "YES" : "NO" ) << endl
#define Yes(n) cout << ((n) ? "Yes" : "No" ) << endl

constexpr int MOD = 1000000007;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> P;
typedef vector<int> vi;
typedef vector<vector<int>> vii;
typedef vector<ll> vl;

template <class T = int> T in() { T x; cin >> x; return (x); }
template <class T = int> void out(T x) { cout << (x) << endl; }

ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }

// value
ll N;
vector<vector<ll>> cake;
vector<pair<vector<ll>, ll>> m_cake;

void solve() {
	
	cin >> N;
	cake.resize(N, vector<ll>(3));
	for (ll i = 0; i < N; i++) {
		ll tmp1, tmp2, tmp3;
		cin >> tmp1 >> tmp2 >> tmp3;
		cake[i][0] = tmp1;
		cake[i][1] = tmp2;
		cake[i][2] = tmp3;
	}

	sort(ALL(cake), [](vector<ll> v1, vector<ll> v2) {
		if (v1[0] != v2[0]) {
			return v1[0] < v2[0];
		}
		else {
			return v1[1] < v2[1];
		}
	});

	m_cake.pb(make_pair(vector<ll>(1, 0), 0));
	for (int i = 0; i < N;) {
		ll tmp = cake[i][0];
		ll tmp3 = i;
		for (int j = i; i < N && cake[j][0] == tmp; j++, i++) {
			pair<vector<ll>,ll> tmp2 = make_pair(vector<ll>(1,i), cake[i][2]);
			for (int k = 0; k < tmp3; k++) {
				vector<ll> tmp_cake = m_cake[k+1].fst;
				ll tmp_cal = m_cake[k+1].scd;
				if (cake[i][0] > cake[tmp_cake.back()][0] && cake[i][1] > cake[tmp_cake.back()][1]) {
					if (tmp2.scd < tmp_cal + cake[i][2]) {
						tmp_cake.pb(i);
						tmp2.fst = tmp_cake;
						tmp2.scd = tmp_cal + cake[i][2];
					}
				}
			}
			m_cake.pb(tmp2);
		}
	}
	
	sort(ALL(m_cake), [](pair<vector<ll>, ll> p1, pair<vector<ll>, ll> p2) {
		return p1.scd > p2.scd;
	});

	cout << m_cake[0].scd << endl;

	return;

}

int main() {

	cin.tie(0);
	ios::sync_with_stdio(false);

	solve();

	return 0;

}