import java.awt.*;
import java.awt.geom.*;
import java.io.*;
import java.util.*;
class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n];
		int[] b = new int[n];
		int[] c = new int[n];
		int[] d = new int[n];
		
		for(int i = 0; i < n; i++) {
			a[i] = sc.nextInt();
			b[i] = sc.nextInt();
			c[i] = sc.nextInt();
			d[i] = sc.nextInt();
		}
		int max = 0;
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < n; j++) {
				
				int ax = a[i];
				int bx = b[i];
				
				int cx = c[j];
				int dx = d[j];
				
				Line2D xL = new Line2D.Double(ax,bx,cx,dx);	
				
				int ay = a[j];
				int by = b[j];
				
				int cy = c[i];
				int dy = d[i];
				
				Line2D yL = new Line2D.Double(ay,by,cy,dy);
				
				int xSum = 0;
				int ySum = 0;

				for(int k = 0; k < n; k++) {
					Line2D target = new Line2D.Double(a[k],b[k],c[k],d[k]);
					if(target.intersectsLine(xL)) xSum++;
					if(target.intersectsLine(yL)) ySum++;
				}
				
				max = Math.max(xSum, max);
				max = Math.max(ySum, max);
				
			}
		}
		
		System.out.println(max);
		
		
		
		
	} 	
	
	
}