module Main where
import Control.Monad
import Control.Applicative
import Data.Maybe
import Data.List
import qualified Text.Printf
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString as BC

import Debug.Trace

------------------------------------------

calc :: Int -> Int
calc x = f 0 5000
  where
    f l r
      | l+1 >= r = l
      | otherwise =
        let m = (l+r) `div` 2 in
        if m*(m+1)`div`2 <= x then f m r else f l m

calc2 :: Int -> Maybe Int
calc2 n =
  let xs = filter (== n) $ do
        a <- takeWhile (< n) $ map (\x -> x*(x+1)`div`2) [0..]
        let b = calc (n-a)
        return $ a + b*(b+1)`div`2
  in case xs of
       []    -> Nothing
       (x:_) -> Just x

main :: IO ()
main = do
  n <- readInt
  if n == (let x = calc n in x*(x+1)`div`2) then print 1
  else do
  print $ case calc2 n of
            Nothing -> 3
            Just _  -> 2

------------------------------------------

{- Int input -}

parseInt :: BC.ByteString -> Int
parseInt = fst . fromJust . BC.readInt

parseInts :: BC.ByteString -> [Int]
parseInts = map parseInt <$> BC.words

readInt :: IO Int
readInt = parseInt <$> BC.getLine

readInts :: IO [Int]
readInts = parseInts <$> BC.getLine

{- Double Formatting -}

doubleFmt :: Double -> String
doubleFmt = Text.Printf.printf "%.12f"