{-# LANGUAGE BangPatterns #-}
import           Control.Monad.Fix
import           Data.Bits
main :: IO ()
main = do
  l <- readLn :: IO Int
  print =<< solve l
solve :: Int -> IO Int
solve l = fix (\loop !i !j !acc -> if (8 :: Int) * (i + j) * (i + i + j) > l
    then return acc
    else loop (i + j) i (acc + ((i `xor` j) .&. (1 :: Int)))
  ) (1 :: Int) (1 :: Int) (0 :: Int)