def read_data():
    N = int(input())
    lines = []
    points = set()
    for i in range(N):
        a, b, c, d = map(int, input().split())
        lines.append((a, b, c, d))
        points.add((a, b))
        points.add((c, d))
    return N, lines, points

def solve(N, lines, points):
    points = list(points)
    record = 0
    for i, (x1, y1) in enumerate(points[:-1]):
        for j, (x2 ,y2) in enumerate(points[i+1:], i+1):
            n_cross = count_cross(x1, y1, x2, y2, lines)
            if n_cross > record:
                record = n_cross
    return record

def count_cross(x1, y1, x2, y2, lines):
    n_cross = 0
    dx = x2 - x1
    dy = y2 - y1
    for a, b, c, d in lines:
        if opposite_side(x1, y1, dx, dy, a, b, c, d):
            n_cross += 1
    return n_cross

def opposite_side(x1, y1, dx, dy, a, b, c, d):
    return  (dx*(b - y1) - dy*(a - x1)) * (dx*(d - y1) - dy*(c - x1)) <= 0

N, lines, points = read_data()
print(solve(N, lines, points))