#!/usr/bin/env python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np
import itertools

N = int(readline())
ABCD = np.array(read().split(), np.int64)
A = ABCD[::4]
B = ABCD[1::4]
C = ABCD[2::4]
D = ABCD[3::4]
X = np.concatenate([A, C]).tolist()
Y = np.concatenate([B, D]).tolist()


answer = 0
for i, j in itertools.combinations(range(len(X)), 2):
    x1 = X[i]
    x2 = X[j]
    y1 = Y[i]
    y2 = Y[j]
    dx = x2 - x1
    dy = y2 - y1
    if dx == 0 and dy == 0:
        continue
    a = dy
    b = -dx
    c = a * x1 + b * y1
    val1 = a * A + b * B - c
    val2 = a * C + b * D - c
    cross = np.count_nonzero(val1 * val2 <= 0)
    if answer < cross:
        answer = cross
print(answer)