def cross?(beam,line)
    va = 2.times.map {|i| line[:a][i] - beam[:a][i]}
    vb = 2.times.map {|i| line[:b][i] - beam[:a][i]}
    vv = 2.times.map {|i| beam[:b][i] - beam[:a][i]}
    rot_a = va[0] * vv[1] - va[1] * vv[0]
    rot_b = vb[0] * vv[1] - vb[1] * vv[0]
    
    (rot_a == 0) || (rot_b == 0) || (rot_a > 0)^(rot_b > 0)
    
end

n = gets.to_i

lines = n.times.map {
    ax,ay,bx,by = gets.split.map(&:to_i)
    {a: [ax,ay], b: [bx,by]}
}

points = lines.each_with_object([]) do |line, points|
    points << line[:a]
    points << line[:b]
end

points.uniq!

puts points.combination(2).map { |a,b|
    lines.select {|line| cross?({a: a, b: b},line)}.count
}.max