N = gets.to_i
A = $<.map{|s|s.split.map &:to_i}
A.map!{|a|a.sort}.sort!

$dp = {}
def f(i)
  $dp[i] ||= 1.+ (0...i).select{|j|
    A[j].zip(A[i]).all?{|a,b|a < b}
  }.map{|j|
    f(j)
  }.max || 0
end

p (0...N).map{|n|f(n)}.max