import strutils, sequtils, algorithm
let
  N = stdin.readline.parseInt
  A = stdin.readline.split.map(parseInt)
var lis = newSeq[int]()
for a in A:
  let lb = lis.lowerBound(a)
  if lb == lis.len:
    lis.add(a)
  else:
    lis[lb] = min(lis[lb], a)
echo(N - lis.len)