{-# LANGUAGE BangPatterns #-}
import           Control.Monad
import           Control.Monad.Fix
import           Data.IORef
import qualified Data.Vector.Fusion.Stream.Monadic as VFSM

main :: IO ()
main = do
  l <- readLn :: IO Int
  ans <- newIORef (0 :: Int)
  rep l $ \m -> repStep (m `mod` 2 + 1) m 2 $ \n -> do
    when (2 * m * (m + m) <= l) $ do
      when (gcd m n == 1) $ modifyIORef' ans succ
  print =<< readIORef ans

stream :: Monad m => Int -> Int -> VFSM.Stream m Int
stream !l !r = VFSM.Stream step l
  where
    step x
      | x * x < r = return $ VFSM.Yield x (x + 1)
      | otherwise = return $ VFSM.Done
    {-# INLINE [0] step #-}
{-# INLINE [1] stream #-}
rep :: Monad m => Int -> (Int -> m ()) -> m ()
rep n = flip VFSM.mapM_ (stream 2 n)
{-# INLINE rep #-}
streamStep :: Monad m => Int -> Int -> Int -> VFSM.Stream m Int
streamStep !l !r !d = VFSM.Stream step l
  where
    step x
      | x < r     = return $ VFSM.Yield x (x + d)
      | otherwise = return $ VFSM.Done
    {-# INLINE [0] step #-}
{-# INLINE [1] streamStep #-}
repStep :: Monad m => Int -> Int -> Int -> (Int -> m ()) -> m ()
repStep l r d = flip VFSM.mapM_ (streamStep l r d)
{-# INLINE repStep #-}