n = int(input())
P = []
for _ in range(n):
    a, b, c, d = map(int, input().split())
    P.append((a, b))
    P.append((c, d))

ans = 0
m = 2 * n
for i in range(m):
    x1, y1 = P[i]
    for j in range(i + 1, m):
        x2, y2 = P[j]
        if x1 == x2 and y1 == y2:
            continue
        res = 0
        for i in range(0, m, 2):
            a, b = P[i]
            c, d = P[i + 1]
            e1 = (x2 - x1) * (b - y1) - (y2 - y1) * (a - x1)
            e2 = (x2 - x1) * (d - y1) - (y2 - y1) * (c - x1)
            if e1 * e2 <= 0:
                res += 1
        ans = max(ans, res)
print(ans)