
import qualified Data.Vector.Unboxed as U
import qualified Data.Vector as V
import qualified Data.ByteString.Char8 as C
import qualified Data.Array.IO as A
import Debug.Trace
import Data.List
import Control.Monad
import Data.Ord
import qualified Data.IntSet as S

r :: Int -> IO (U.Vector Int)
r n = U.unfoldrN n (C.readInt . C.dropWhile (==' ')) <$> C.getLine

r' :: IO [Int]
r'  =   unfoldr    (C.readInt . C.dropWhile (==' ')) <$> C.getLine

rp :: IO (Int,Int)
rp  = toTup . unfoldr    (C.readInt . C.dropWhile (==' ')) <$> C.getLine

toTup [a,b] = (a,b)

main :: IO ()
main = do
    n <- readLn
    as <- replicateM n readLn :: IO [Int]
    print $ solve as 0

solve :: [Int] -> Int -> Int
solve [] ac = ac
solve as ac = solve (as `minus` solveAux as []) (ac+1)

solveAux :: [Int] -> [Int] -> [Int]
solveAux  []    rAc = reverse rAc
solveAux (a:as) rAc = solveAux (filter (>a) as) (a:rAc)

minus :: [Int] -> [Int] -> [Int]
minus [] _ = []
minus as [] = as
minus (a:as) (b:bs) = if a==b then minus as bs
                                else a:(minus as (b:bs))




