#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <cmath>

#define FORR(i,b,e) for(int i=(b);i<(int)(e);++i)
#define FOR(i,e) FORR(i,0,e)
#define ALL(c) begin(c), end(c)
#define sortuniq(v) sort(v.begin(), v.end()), v.erase(unique(v.begin(),v.end()),v.end())
#define dump(var) cerr << #var ": " << var << "\n"
#define dumpc(con) for(auto& e: con) cerr << e << " "; cerr<<"\n"

typedef long long ll;
typedef unsigned long long ull;

const double EPS = 1e-6;
const int d4[] = {0, -1, 0, 1, 0};

using namespace std;

struct Point {
    int x, y;
};

int cross(int a, int b, int c, int d) {
    return a * d - b * c;
}

bool crossing(Point &a, Point &b, Point &c, Point&d) {
    return cross(b.x-a.x, b.y-a.y, c.x-a.x, c.y-a.y) *
           cross(b.x-a.x, b.y-a.y, d.x-a.x, d.y-a.y)
           <= 0;
}

Point p[105][2];

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;
    FOR(i, N) {
        cin >> p[i][0].x >> p[i][0].y >> p[i][1].x >> p[i][1].y;
    }

    int max_count = 0;
    FOR(i, N) FOR(ii, 2) {
        Point &a = p[i][ii];
        FORR(j, i+1, N) FOR(jj, 2) {
            Point &b = p[j][jj];
            int cnt = 2;
            FOR(k, N) {
                if (k==i || k==j) continue;
                cnt += (int)crossing(a, b, p[k][0], p[k][1]);
            }
            max_count = max(max_count, cnt);
        }
    }

    cout << max_count << endl;
    
    return 0;
}