#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <complex>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;

typedef complex<double> P;
#define EPS 1.0e-9

double outP(const P& p, const P& q){ return imag(conj(p)*q); }
struct L : public vector<P> {
  L(const P& a, const P& b){ push_back(a); push_back(b); }
};
bool intersectLS(const L& l, const L& s){return outP(l[1]-l[0],s[0]-l[0])*outP(l[1]-l[0],s[1]-l[0])<EPS;}

int main(){
  int N;
  cin >> N;
  vector< pair<int,int> > vall, v1, v2;
  rep(i,N){
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    v1.push_back(make_pair(a,b));
    v2.push_back(make_pair(c,d));
    vall.push_back(make_pair(a,b));
    vall.push_back(make_pair(c,d));
  }

  int ret = 0;
  rep(i,vall.size()){
    rep(j,vall.size()){
      if(i==j) continue;
      int tmp = 0;
      L line(P(vall[i].first, vall[i].second), P(vall[j].first, vall[j].second));
      rep(k,N){
        L ln(P(v1[k].first, v1[k].second), P(v2[k].first, v2[k].second));
        if(intersectLS(line, ln)) tmp++;
      }
      ret = max(ret, tmp);
    }
  }

  cout << ret << endl;
  
  return 0;
}