{-# LANGUAGE ScopedTypeVariables #-}
-- extension section
{-# OPTIONS_GHC -O2 -funbox-strict-fields #-}
{-# LANGUAGE BangPatterns      #-}
{-# LANGUAGE CPP               #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TupleSections     #-}
-- not supported extension
--{-# LANGUAGE Strict, StrictData #-}


module Main where

-- @@@@@@@@@@@@@@@@@--
-- import section   --
-- @@@@@@@@@@@@@@@@@--
--    import A.B.C( function name )  ...
-- or import A.B.C 

--
import           Prelude hiding(
  getLine,
  getContents,
  lines,
  words
  )

-- standard library
import           Control.Monad.ST
import           Control.Applicative
import           Data.Char
import           Data.Ratio


-- bytestring
import qualified Data.ByteString.Char8       as B
import qualified Data.ByteString.Unsafe      as B


-- containers
import           Data.Set

-- deepseq


-- regex-posix


-- text
import           Data.Text.Lazy.IO as TIO
import           Data.Text.Lazy as T
import           Data.Text.Lazy.Read as TR

-- import Data.Text.IO as TIO
-- import Data.Text as T
-- import Data.Text.Read as TR



-- unordered-containers


-- vectors
import qualified Data.Vector as V
import           Data.Vector.Unboxed as UV
import           Data.Vector.Unboxed.Mutable as MV


-- mtl


-- @@@@@@@@@@@@@@@@@--
-- main section     --
-- @@@@@@@@@@@@@@@@@--

main :: IO ()
main = do
  input <- getInput
  Prelude.putStr . show . getAnswer $ input 

-- main :: IO()
-- main = do
--   answer <- getInputandanser
--   putStr . show $ answer


-- @@@@@@@@@@@@@@@@@@@@@--
-- I/O DataType section --
-- @@@@@@@@@@@@@@@@@@@@@--
data Input = I (Int, UV.Vector (Int, Int) )
  deriving(Show)

type Answer = Int


-- @@@@@@@@@@@@@@@@@--
-- answerSection    --
-- @@@@@@@@@@@@@@@@@--
getInput :: IO Input
getInput = do
  n <- (UV.!0) <$> intVectorFromLine 1 
  input <- generatePairVectorFromLine n
  return $ I (n , input)

getAnswer :: Input -> Answer 
getAnswer (I (n, v)) | UV.length v == 1 = 0
                     | otherwise = (2^n `mod` 998244353 )- (1 + n + res) `mod` 998244353
  where res =  go 0 1 0 Data.Set.empty
        go i1 i2 accum' lset 
          | i1 == n-2 && i2 == n-1 = ( (accum'+dScore)`mod`998244353)
          | i2 == n-1 = go (i1+1) (i1+2) ( (accum'+dScore)`mod`998244353) ( ins l )
          | otherwise = go i1 (i2+1) ( (accum'+dScore)`mod`998244353) (ins l)
          where l = lineFromPoint n1 n2 
                dScore | l `member` lset = 0
                       | otherwise = 2^k - k - 1
                (k:: Int) = case l of
                  L (_,_) -> (1+). V.length .V.filter  ( == True) $ V.map ( (l==) . (lineFromPoint n2)) (convert v :: V.Vector (Int,Int) )  
                  L0 _ -> V.length .V.filter  ( == True) $ V.map ( (l==) . (lineFromPoint n2)) (convert v :: V.Vector (Int,Int) )  
                n1 = v!i1
                n2 = v!i2
                ins = flip insert lset

getInputAndAnser :: IO Answer
getInputAndAnser = undefined


-- @@@@@@@@@@@@@@@@@@@@@@@@@@--
-- question unique section    --
-- @@@@@@@@@@@@@@@@@@@@@@@@@@--

data Line = L (Ratio Int, Ratio Int) | L0 Int
  deriving(Show, Eq, Ord)

lineFromPoint :: (Int,Int) -> (Int,Int) -> Line
lineFromPoint (x0,y0) (x1,y1)
  | x0 /= x1 =
      L ( (y1-y0) % (x1-x0) , ( (x1-x0)*y0 - (y1-y0)*x0) % (x1-x0) )
  | otherwise = L0 x0


-- @@@@@@@@@@@@@@@@@--
-- util section     --
-- @@@@@@@@@@@@@@@@@--

-- standard Input Function
gLine :: IO Text
gLine = getLine

gContents :: IO Text
gContents = getContents

-- intVectorFromline 5  ("1 2 3 4 5") -> vector <1,2,3,4,5> 
intVectorFromLine ::Int -> IO ( Vector Int )
intVectorFromLine n = UV.unfoldrN n (B.readInt.B.dropWhile isSpace) <$> B.getLine

pairFromLine :: IO (Int,Int)
pairFromLine = do
  v <- intVectorFromLine 2
  return ( v ! 0, v ! 2)

generatePairVectorFromLine :: Int -> IO ( Vector (Int, Int) )
generatePairVectorFromLine n = generateM n (const pairFromLine)
