#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
#include<immintrin.h>
#include<unordered_map>
using namespace std;
#define MAX 102
struct st{
	double a;
	double b;

	double c;
	double d;
	st(){
		cin >> a >> b >> c >> d;
	}
};
vector<st> v;
vector<pair<double, double> > g;
int n;
double func(double a, double b,double x){
	return a*x + b;
}
bool inclu(double a,double b,double c,double d){
	if (b < c || d < a){
		return false;
	}
	return true;
}
int main(){
	scanf("%d", &n);
	for (int i = 0; i < n; i++){
		v.push_back(st());
	}
	for (int i = 0; i < v.size(); i++){
		g.push_back(make_pair(v[i].a,v[i].b));
		g.push_back(make_pair(v[i].c, v[i].d));
	}
	sort(g.begin(), g.end());
	g.erase(unique(g.begin(), g.end()), g.end());
	int maxt = 0;
	for (int i = 0; i < g.size(); i++){
		for (int j = i + 1; j < g.size(); j++){
			if (g[i].first == g[j].first){
				int countt = 0;
				for (int ii = 0; ii < v.size(); ii++){
					if (min(v[ii].c,v[ii].a) <= g[i].first&&g[i].first <= max(v[ii].a,v[ii].c)){
						countt++;
					}
				}
				maxt = max(maxt, countt);
				continue;
			}
			double k = g[j].second - g[i].second;
			double s = g[i].first - g[j].first;
			k /= s;
			double N = k*-g[j].first;
			N += g[j].second;
			//y=kX+N
			int countt = 0;
			for (int ii = 0; ii < v.size(); ii++){
				double x1 = func(k, N, v[ii].a);
				double x2 = func(k, N, v[ii].c);
				if (x1 > x2){
					swap(x1, x1);
				}
				if (inclu(min(v[ii].b, v[ii].d), max(v[ii].b, v[ii].d), x1, x2)){
					countt++;
				}
			}
			maxt = max(maxt, countt);
		}
	}
	cout << maxt << endl;
	return 0;
}