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)]
max_num = 0
for i in range(N-1):
	for j in range(i+1,N):
		a1, b1, c1, d1 = line[i]
		a2, b2, c2, d2 = line[j]
		max_num = max(max_num,count(a1,b1,a2,b2),count(a1,b1,c2,d2),count(c1,d1,a2,b2),count(c1,d1,c2,d2))
print max_num