import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.complex, std.container, std.math, std.numeric, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
real readReal() { return readToken.to!real; }

bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }

int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }


alias Pt = Tuple!(long, "x", long, "y");
int sig(long r) {
  return (r > 0) ? +1 : (r < 0) ? -1 : 0;
}
long tri(Pt a, Pt b, Pt c) {
  return (b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x);
}

bool iLS(Pt a, Pt b, Pt c, Pt d) {
  return (sig(tri(a, b, c)) * sig(tri(a, b, d)) <= 0);
}

int N;
Pt[] P, Q;

void main() {
  try {
    for (; ; ) {
      N = readInt();
      P = new Pt[N];
      Q = new Pt[N];
      foreach (i; 0 .. N) {
        P[i].x = readLong();
        P[i].y = readLong();
        Q[i].x = readLong();
        Q[i].y = readLong();
      }
      
      auto ps = P.dup ~ Q.dup;
      int ans = 1;
      foreach (a; ps) foreach (b; ps) {
        if (a != b) {
          int cnt;
          foreach (i; 0 .. N) {
            if (iLS(a, b, P[i], Q[i])) {
              ++cnt;
            }
          }
          chmax(ans, cnt);
        }
      }
      writeln(ans);
    }
  } catch (EOFException e) {
  }
}