{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE BinaryLiterals #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE NumDecimals #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE FlexibleContexts #-}

{-# OPTIONS_GHC -O2 #-}
{-# OPTIONS_GHC -Wno-tabs #-}

import Control.Applicative
import Control.Arrow
import Control.Monad
import Control.Monad.ST

import Data.Char
import Data.List
import Data.Maybe
import Data.Either
import Data.Bool

import qualified Data.ByteString.Char8 as B

import Data.Array
import Data.Array.ST.Safe
import Data.STRef

import Debug.Trace
import Text.Printf

readInt = fst . fromJust . B.readInt <$> B.getLine
readInteger = fst . fromJust . B.readInteger <$> B.getLine
readInts = map ( fst . fromJust . B.readInt ) . B.words <$> B.getLine
readIntegers = map ( fst . fromJust . B.readInteger ) . B.words <$> B.getLine
readStr = head <$> readStrs
readStrs = map B.unpack . B.words <$> B.getLine

yesno = bool "No" "Yes"
mp [ a, b ] = ( a, b )

modifyArray a i f = writeArray a i =<< f <$> readArray a i

printList :: Show a => [a] -> IO ()
printList = putStrLn . intercalate " " . map show

a *% b = ( a * b ) `mod` 998244353

main = do
	n <- readInt
	cs <- readInts
	let
	 	cnt op = length . filter op
		posis = cnt ( 0 < ) cs
		negas = cnt ( < 0 ) cs
		zeros = n - posis - negas
		res = if posis == 0 && negas == 0
			then 1
			else if 0 < posis && 0 < negas
				then 2 *% choose ( posis - 1 ) *% choose ( negas - 1 ) *% if 0 < zeros
					then 3
					else 1
				else choose ( posis - 1 ) *% choose ( negas - 1 ) *% if 0 < zeros
					then 2
					else 1
	print res

choose n = foldl' (*%) 1 $ take ( max 0 n ) $ repeat 2