#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <algorithm>
using namespace std;

#define REP(i,n) for(int i=0; i<n; ++i)
#define FOR(i,a,b) for(int i=a; i<=b; ++i)
#define FORR(i,a,b) for (int i=a; i>=b; --i)
#define ALL(c) (c).begin(), (c).end()

typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<VI> VVI;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;

int main() {
    int n;
    cin >> n;
    vector<pair<int, P> > a(n);
    REP(i,n){
        VI x(3);
        REP(i,3) cin >> x[i];
        sort(ALL(x));
        a[i].first = x[0];
        a[i].second.first = x[1];
        a[i].second.second = x[2];
    }
    sort(ALL(a));
    VI dp(n,1);
    FOR(i,1,n-1){
        REP(j,i){
            if (a[i].first > a[j].first && a[i].second.first > a[j].second.first
                && a[i].second.second > a[j].second.second){
                dp[i] = max(dp[i], dp[j] + 1);
            }
        }
    }
    int ans = 0;
    REP(i,n) ans = max(ans, dp[i]);
    cout << ans << endl;

    return 0;
}