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 <- B.getLine
  vec <- V.unsafeNew n
  mapM_ ((\(i, v) -> V.unsafeWrite vec i v) . convert) . zip [0..] $ B.words ds
  result <- proc n k 0 vec
  putStrLn result

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

convert :: (Int, B.ByteString) -> (Int, Int)
convert (i, v) = (i, flip (-) 1 . read . B.unpack $ v)

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