#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using pii = pair<int,int>;

#define all(x) x.begin(), x.end()

struct Phone {
  int h, w, t;
  bool operator<(const Phone &rhs) const {
    if (h == rhs.h) {
      return w > rhs.w;
    }
    return h < rhs.h;
  }
};

struct BIT {
  vector<ll> data;
  BIT(int n): data(n + 1) {}
  ll getmax(int a) {
    ll ret = 0;
    for(int i = a; i > 0; i -= i & -i) {
      ret = max(ret, data[i]);
    }
    return ret;
  }
  void update(int a, ll w) {
    for(int i = a; i < data.size(); i += i & -i) {
      data[i] = max(data[i], w);
    }
  }
};


ll LIS(vector<ll> &A) {
  vector<ll> dp; 
  for(int i = 0; i < A.size(); i++) {
    int k = lower_bound(all(dp), A[i]) - dp.begin();
    if (k == dp.size()) dp.push_back(A[i]);
    else dp[k] = A[i];
  }
  return dp.size();
}

ll LIS_dp(vector<ll> &A) {
  vector<ll> dp(A.size());
  for (int i = 0; i < A.size(); i++) {
    ll ma = 0;
    for (int j = 0; j < i; j++) {
      if (A[j] >= A[i]) continue;
      ma = max(ma, dp[j]);
    }
    dp[i] = ma + 1;
  }
  return *max_element(all(dp));
}

// BIT解（想定解, O(N log N)）
ll solve1(int N, vector<Phone> &P) {
  vector<int> W(N);
  for (int i = 0; i < N; i++) {
    W[i] = P[i].w;    
  }
  sort(all(W));
  W.erase(unique(W.begin(), W.end()), W.end());

  BIT bit(N + 2);
  for(int i = 0; i < N; i++) {
    int k = lower_bound(all(W), P[i].w) - W.begin() - 1;
    k += 2; // for BIT
    ll mi = bit.getmax(k);
    bit.update(k + 1, mi + P[i].t);
  }
  return bit.getmax(N + 2);
}

// Naive DP解(O(N^2))
ll solve2(int N, vector<Phone> &P) {
  vector<ll> dp(N, 0);
  for(int i = 0; i < N; i++) {
    ll ma = 0;
    for(int j = 0; j < i; j++) {
      if (P[j].w >= P[i].w) continue;
      ma = max(ma, dp[j]);
    }
    dp[i] = ma + P[i].t;
  }
  return *max_element(all(dp));
}

// 二分探索 LIS解(O(N log N), T_i = 1)
ll solve3(int N, vector<Phone> &P) {
  vector<ll> W(N);
  for (int i = 0; i < N; i++) {
    W[i] = P[i].w;    
  }
  return LIS(W);
}

// LIS DP解(O(N^2), T_i = 1)
ll solve4(int N, vector<Phone> &P) {
  vector<ll> W(N);
  for (int i = 0; i < N; i++) {
    W[i] = P[i].w;    
  }
  return LIS_dp(W);
}

// 全探索解(O(2^N N))
ll solve5(int N, vector<Phone> &P) {
  ll ans = 0;
  for(int i = 0; i < 1 << N; i++) {
    vector<ll> W;
    ll sum = 0;
    for(int j = 0; j < N; j++) {
      if (i >> j & 1) {
        W.push_back(P[j].w);
        sum += P[j].t;
      }
    }
    bool flag = true;
    for(int j = 0; j + 1 < W.size(); j++) {
      if (W[j] >= W[j + 1]) {
        flag = false;
        break;
      }
    }
    if (!flag) continue;
    ans = max(ans, sum);
  }
  return ans;
}

// 前処理 いらないPhoneの削除と、順番の並び替えを行う
void preprocess(vector<Phone> &P) {
  int N = P.size();
  map<pii, int> M;
  for(int i = 0; i < N; i++) {
    M[{P[i].h, P[i].w}] = max(M[{P[i].h, P[i].w}], P[i].t);
  }
  vector<Phone> newP;
  for(auto &&x : M) {
    newP.push_back({x.first.first, x.first.second, x.second});
  }
  P = newP;
  sort(all(P));
}

void solve() {
  int N;
  cin >> N;
  if (N < 1 || N > 200000) exit(1);
  vector<Phone> P;
  for(int i = 0; i < N; i++) {
    int h, w, t;
    cin >> h >> w >> t;
    if (h < 1 || h > 1000000000) exit(1);
    if (w < 1 || w > 1000000000) exit(1);
    if (t < 1 || t > 1000000000) exit(1);
    P.push_back({h, w, t});
  }

  preprocess(P);
  N = P.size();

  constexpr int num_solver = 5;
  bool solve3_f = true;
  for (int i = 0; i < N; i++) {
    if (P[i].t != 1) solve3_f = false;
  }
  bool solve4_f = solve3_f && (N <= 2000);
  bool flags[num_solver] = {true, N <= 2000, solve3_f, solve4_f, N <= 16};
  ll (*solvers[num_solver])(int, vector<Phone> &) = {solve1, solve2, solve3, solve4, solve5};

  vector<ll> ans;
  for (int i = 0; i < num_solver; i++) {
    if (flags[i]) ans.push_back(solvers[i](N, P));
  }

  set<ll> S;
  for (int i = 0; i < ans.size(); i++) {
    S.insert(ans[i]);
  }

  if (S.size() > 1) {
    cout << "Error!" << endl;
    for (int i = 0; i < ans.size(); i++) {
      cout << ans[i] << endl;
    }
  } else {
    cout << ans[0] << endl;
  }
}

int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);
  cout.setf(ios::fixed);
  cout.precision(16);
  solve();
  return 0;
}