package no245;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		Vector2[][] seg = new Vector2[n][2];
		for(int i=0;i<n;i++) {
			seg[i][0] = new Vector2(sc.nextLong(), sc.nextLong());
			seg[i][1] = new Vector2(sc.nextLong(), sc.nextLong());
		}
		int ans = 0;
		for(int i=0;i<=200;i++) {
			for(int j=0;j<=200;j++) {
				if (i == 0 && j == 0) {
					continue;
				}
				Vector2 d = new Vector2(i, j);
				ArrayList<Event> al = new ArrayList<>();
				for(int k=0;k<n;k++) {
					long x1 = seg[k][0].dot(d);
					long x2 = seg[k][1].dot(d);
					al.add(new Event(Math.min(x1, x2), 1));
					al.add(new Event(Math.max(x1, x2), -1));
				}
				Collections.sort(al);
				int sum = 0;
				for(Event e:al) {
					sum += e.a;
					ans = Math.max(ans, sum);
				}
			}
		}
		System.out.println(ans);
	}

}
class Event implements Comparable<Event>{
	long x,a;
	public Event(long x,long a) {
		this.x = x;
		this.a = a;
	}
	public int compareTo(Event o) {
		if (x != o.x) {
			return Long.compare(x, o.x);
		}
		return - Long.compare(a, o.a);
	}
	public String toString() {
		return "[" + x + "," + a + "]";
	}
}
class Vector2 {
	long x = 0;
	long y = 0;
	public Vector2(long x,long y) {
		this.x = x;
		this.y = y;
	}
	public long dot(Vector2 v) {
		return this.x*v.x+this.y*v.y;
	}
	public long cross(Vector2 v) {
		return this.x*v.y-this.y*v.x;
	}
	public Vector2 add(Vector2 v) {
		return new Vector2(this.x+v.x,this.y+v.y);
	}
	public Vector2 subtract(Vector2 v) {
		return new Vector2(this.x-v.x,this.y-v.y);
	}
	public Vector2 multiply(long k) {
		return new Vector2(k*this.x,k*this.y);
	}
	public String toString() {
		return this.x + " " + this.y;
	}
	public boolean equals(Object o) {
		if (o instanceof Vector2) {
			Vector2 v = (Vector2) o;
			return x == v.x && y == v.y;
		}
		return super.equals(o);
	}
}