import qualified Data.ByteString.Char8 as B
import qualified Data.Vector.Unboxed.Mutable as V
import Data.Int (Int64)

main :: IO ()
main = do
  (n, k) <- fmap toTuple $ B.getLine
  ds <- fmap B.words $ B.getLine
  vec <- V.unsafeNew n :: IO (V.IOVector Int)
  mapM_ ((\(i, v) -> V.unsafeWrite vec i v) . (\(i, v) -> (i, flip (-) 1 . read . B.unpack $ v))) $ zip [0..] ds
  result <- sortCount n k 0 vec
  putStrLn result

toTuple :: B.ByteString -> (Int, Int64)
toTuple = (\[x, y] -> (read . B.unpack $ x, read . B.unpack $ y)) . B.words

sortCount :: Int -> Int64 -> Int -> V.IOVector Int -> IO (String)
sortCount n k i _
  | k < 0  = return "NO"
  | n == i = return $ if odd k then "NO" else "YES"
sortCount n k i xs = do
  a1 <- V.unsafeRead xs i
  if a1 == i
     then sortCount n k (i + 1) xs
     else V.unsafeSwap xs i a1 >> sortCount n (k - 1) i xs