#define _USE_MATH_DEFINES
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define RT return
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;

template<class Val, class Cmp>
class DynamicRMQ {
    int n;
    Val init;
    vector<Val> dat;
    Cmp cmp;
    inline Val query(int a, int b, int k, int l, int r) {
        if (r <= a || b <= l) return init;
        if (a <= l && r <= b) return dat[k];
        else {
            Val vl, vr;
            vl = query(a, b, k << 1, l, (l + r) >> 1);
            vr = query(a, b, (k << 1) | 1, (l + r) >> 1, r);
            return cmp(vl, vr) ? vl : vr;
        }
    }
public:
    DynamicRMQ() {}
    DynamicRMQ(int n_, Val init_) :n(1), init(init_) {
        for (; n<n_; n <<= 1);
        dat = vector<Val>(n << 1, init);
    }
    void update(int k, Val a) {
        k += n;
        dat[k] = a;
        while (k > 1) {
            k >>= 1;
            dat[k] = cmp(dat[k << 1], dat[(k << 1) | 1]) ? dat[k << 1] : dat[(k << 1) | 1];
        }
    }
    Val query(int a, int b) {
        return query(a, b, 1, 0, n);
    }
};

typedef DynamicRMQ<long long, less<long long> > RMinQ64;
typedef DynamicRMQ<long long, greater<long long> > RMaxQ64;
typedef DynamicRMQ<int, less<int> > RMinQ32;
typedef DynamicRMQ<int, greater<int> > RMaxQ32;

template<class Val>
vector<Val> compress(vector<Val> &v) {
    vector<Val> a = v;
    sort(all(a));
    a.erase(unique(all(a)), a.end());
    each(b, v)b = (int)(lower_bound(all(a), b) - a.begin());
    return a;
}

void solve() {
    int N;
    cin >> N;
    vi A(N), B(N), C(N);
    rep(i, N) {
        cin >> A[i] >> B[i] >> C[i];
    }
    compress(B);

    map<int, vector<pii>> M;
    rep(i, N) {
        M[A[i]].emplace_back(B[i], C[i]);
    }
    RMaxQ64 ma(N + 1, 0ll);
    
    each(p, M) {
        auto &V = p.second;
        sort(V.rbegin(), V.rend());
        each(q, V) {
            ma.update(q.first + 1, ma.query(0, q.first + 1) + q.second);
        }
    }
    cout << ma.query(0, N + 1) << endl;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout << fixed << setprecision(15);
	solve();
	return 0;
}