from itertools import combinations as comb
def count(x1, y1, x2, y2):
	num = 0
	for a,b,c,d in line:
		if ((x1-x2)*(b-y1) - (y1-y2)*(a-x1))*((x1-x2)*(d-y1) - (y1-y2)*(c-x1)) <= 0:
			num += 1
	return num

N = int(raw_input())
line = [map(int,raw_input().split(" ")) for i in range(N)]
p = set([(line[i/2][(2*i)%4],line[i/2][(2*i)%4+1]) for i in range(2*N)])
max_num = 1
for p1, p2 in comb(p,2):
	tmp = count(p1[0],p1[1],p2[0],p2[1])
	if tmp > max_num:
		max_num = tmp
print max_num