import Control.Applicative ((<$>), (<*>))
import Data.ByteString.Char8 (ByteString)
import qualified Data.ByteString.Char8 as B
import Data.List (unfoldr)
import Data.Char (isSpace)
import Data.IntMap (IntMap, (!))
import qualified Data.IntMap as IM

main :: IO ()
main = solve <$> readLn <*> (readil B.readInt <$> B.getLine) >>= print

solve :: Int -> [Int] -> Int
solve n xs = f (db ! n) (n - 1)
  where db = IM.fromList $ zip xs [1..]
        f _ 0 = 0
        f i m = if mi < i then f mi (m - 1) else m
          where mi = db ! m
                
readil :: Integral a =>  (ByteString -> Maybe (a, ByteString)) -> ByteString -> [a]
readil f = unfoldr g
  where
    g s = do
      (n, s') <- f s
      return (n, B.dropWhile isSpace s')