#define _USE_MATH_DEFINES
 
#include <iostream>
#include <iomanip>
 
#include <algorithm>
#include <cmath>
 
#include <string>
//#include <array>
#include <list>
#include <queue>
#include <vector>
#include <complex>
#include <set>
#include <map>
 
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
 
#define PII pair<int,int>
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////
int N;
vector<pair<PII,PII> > sline;
int solve(PII L1,PII L2){
	int ans=0;
	int T0,T1;
	if(L1==L2){
		return ans;
	}
	rep(i,N){
		T0 = (L1.first-L2.first)*(sline[i].first.second-L1.second)+
			(L1.second-L2.second)*(L1.first-sline[i].first.first);
		T1 = (L1.first-L2.first)*(sline[i].second.second-L1.second)+
			(L1.second-L2.second)*(L1.first-sline[i].second.first);
		if(T0*T1 <= 0){
			++ans;
		}
	}
	return ans;
}


int main(void){
    std::cin.tie(0); 
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    //cout << setprecision(10);//
	
	
	cin>>N;
	if(N<=2){
		P(N);
		return 0;
	}
	pair<PII,PII> line;
	int x0,y0,x1,y1;
	rep(i,N){
		cin>>x0>>y0>>x1>>y1;
		sline.push_back( pair<PII,PII>(PII(x0,y0),PII(x1,y1) ) );
	}
	int ans = 0,tans;
	for(int i=0;i<N-1;++i){
		for(int j=i+1;j<N;++j){
			tans = solve(sline[i].first,sline[j].first);
			ans = max(ans,tans);
			tans = solve(sline[i].first,sline[j].second);
			ans = max(ans,tans);
			tans = solve(sline[i].second,sline[j].first);
			ans = max(ans,tans);
			tans = solve(sline[i].second,sline[j].second);
			ans = max(ans,tans);
		}
	}
	P(ans);
    return 0;
}