split :: String -> [String]
split = go ("", [])
  where
    go :: (String, [String]) -> String -> [String]
    go (a, acc) "" = acc <> [a]
    go (a, acc) (' ' : xs) = go ("", acc <> [a]) xs
    go (a, acc) (x : xs) = go (a <> [x], acc) xs

prompt :: IO [String]
prompt = do split <$> getLine

bin :: Int -> [Int]
bin x
  | x <= 1 = [x]
  | otherwise =
    let (n, r) = x `quotRem` 2
     in bin n <> [r]

d :: Int -> Int
d = sum . bin

solve :: Int -> Int
solve n = go 1 1 []
  where
    go :: Int -> Int -> [Int] -> Int
    go c p m
      | n == p = c
      | p `elem` m = -1
      | otherwise = let proceed = p + d p
                     in go (c + 1) (if proceed > n then p - d p else proceed) (p : m)

main :: IO ()
main = do
  n :: Int <- read . head <$> prompt
  print $ solve n