import           Control.Arrow
import           Control.Monad
import qualified Data.ByteString.Char8       as BSC8
import qualified Data.Vector.Unboxed         as VU
import qualified Data.Vector.Unboxed.Mutable as VUM

main :: IO ()
main = do
  (n, k) <- parse2
  solver n k >>= print . VU.length . VU.filter (>=k)

solver :: Int -> Int -> IO (VU.Vector Int)
solver n k = do
  table <- VU.unsafeThaw $ VU.replicate (n + 1) (0 :: Int)
  forM_ [2..n] $ \i -> do
    x <- VUM.read table i
    when (x == 0) $ do
      VUM.write table i 1
      forM_ [2 * i, 3 * i .. n] $ \j -> VUM.unsafeModify table (+1) j
  VU.unsafeFreeze table

type Parser a = BSC8.ByteString -> Maybe (a, BSC8.ByteString)
parseInt :: Parser Int
parseInt = fmap (second BSC8.tail) . BSC8.readInt
parse2 :: IO (Int, Int)
parse2 = (\vec -> (vec VU.! 0, vec VU.! 1)) . VU.unfoldrN 2 parseInt <$> BSC8.getLine