/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.05.25 18:40:40
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

vector< tuple< ll, ll, ll, ll > > v;
// (a,b)-(c,d)を通る直線がv[t]を通るか
bool f(int a, int b, int c, int d, int t) {
    int x1 = get<0>(v[t]);
    int y1 = get<1>(v[t]);
    int x2 = get<2>(v[t]);
    int y2 = get<3>(v[t]);
    if (((b-d)*(x1-a)+(c-a)*(y1-b)) * ((b-d)*(x2-a)+(c-a)*(y2-b)) <= 0) {
        return true;
    }
    return false;
}
int main() {
    int n;
    cin >> n;
    v.resize(n);
    vector< pair< ll, ll > > v2;
    for (int i = 0; i < n; i++) {
        ll a, b, c, d;
        cin >> a >> b >> c >> d;
        v[i] = make_tuple(a, b, c, d);
        v2.push_back({a, b});
        v2.push_back({c, d});
    }
    int ans = 0;
    for (int i = 0; i < v2.size(); i++) {
        for (int j = i + 1; j < v2.size(); j++) {
            int cnt = 0;
            for (int k = 0; k < n; k++) {
                if (f(v2[i].first, v2[i].second, v2[j].first, v2[j].second, k)) {
                    cnt++;
                }
            }
            ans = max(ans,cnt);
        }
    }
    cout << ans << endl;
    return 0;
}