struct Point
  property x : Int32
  property y : Int32

  def initialize(@x, @y)
  end
end

def intersect(p1, p2, p3, p4)
  ((p1.x - p2.x) * (p3.y - p1.y) + (p1.y - p2.y) * (p1.x - p3.x)) *
    ((p1.x - p2.x) * (p4.y - p1.y) + (p1.y - p2.y) * (p1.x - p4.x)) <= 0
end

n = read_line.to_i
a1, a2 = (1..n).map {
  a, b, c, d = read_line.split.map(&.to_i)
  [Point.new(a, b), Point.new(c, d)]
}.transpose
puts (a1 + a2).permutations(2).max_of { |(p1, p2)|
  p1 == p2 ? 0 : (0...n).count { |i|
    intersect(p1, p2, a1[i], a2[i])
  }
}