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(-100,101):
	for j in range(-100,101):
		max_num = max(max_num, count(-100,i,100,j), count(i,-100,j,100))
print max_num