N, K = gets.split.take(2).map(&:to_i)
WA = N.times.map{ gets.to_i }

cargo = []
WA.each{|w|
  if w > 0
    idx = cargo.bsearch_index{|v|v >= w}
    over_w = idx ? cargo.size - idx : 0
    if over_w < K
      cargo[idx || cargo.size, 0] = w
    end
    # p "a" if cargo.sort != cargo
  else
    idx = cargo.bsearch_index{|v|v == -w}
    cargo.delete_at(idx) if idx
  end
}
p cargo.size