#include <bits/stdc++.h>
using namespace std;
#define all(c) (c).begin(),(c).end()
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--)
#define REP(i,m,n) for(int i=(int)(m);i<(int)(n);i++)
#define rep(i,n) REP(i,0,n)
#define iter(c) __typeof((c).begin())
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
#define mem(a) memset(a,0,sizeof(a))
#define pd(a) printf("%.10f\n",a)
#define pb(a) push_back(a)
#define in(a) insert(a)
#define pi M_PI
#define R cin>>
#define F first
#define S second
#define C class
#define ll long long
#define ln cout<<'\n'
#define _(_1,_2,_3,N,...)N
#define pr(...) _(__VA_ARGS__,pr3,pr2,pr1)(__VA_ARGS__)
template<C T>void pr1(T a){cout<<a;ln;}
template<C T,C T2>void pr2(T a,T2 b){cout<<a<<' '<<b;ln;}
template<C T,C T2,C T3>void pr3(T a,T2 b,T3 c){cout<<a<<' '<<b<<' '<<c;ln;}
template<C T>void PR(T a,int n){rep(i,n){if(i)cout<<' ';cout<<a[i];}ln;}
bool check(int n,int m,int x,int y){return x>=0&&x<n&&y>=0&&y<m;}
const ll MAX=1000000007,MAXL=1LL<<60,dx[4]={-1,0,1,0},dy[4]={0,1,0,-1};

const double EPS = 1e-6;
typedef complex<double> P;
double cross(const P& a, const P& b) {return imag(conj(a)*b);}
bool intersectLS(const vector<P> &l, const vector<P> &s) {
  return cross(l[1]-l[0],s[0]-l[0])*cross(l[1]-l[0],s[1]-l[0])<EPS;
}

void Main() {
  int n;
  cin >> n;
  vector<P> l[n],p;
  rep(i,n) {
    double x1,x2,y1,y2;
    cin >> x1 >> y1 >> x2 >> y2;
    l[i].pb(P(x1,y1));
    l[i].pb(P(x2,y2));
    p.pb(P(x1,y1));
    p.pb(P(x2,y2));
  }
  int ans=0;
  rep(i,p.size()) {
    REP(j,i+1,p.size()) {
      if(p[i]==p[j]) continue;
      vector<P> a;
      a.pb(p[i]);
      a.pb(p[j]);
      int cnt=0;
      rep(x,n) {
        if(intersectLS(a,l[x])) cnt++;
      }
      ans=max(ans,cnt);
    }
  }
  pr(ans);
}

int main() {
  ios::sync_with_stdio(0);cin.tie(0);
  Main();return 0;
}