{-# OPTIONS_GHC -O2 #-}
{-# LANGUAGE BangPatterns, BinaryLiterals, CPP, DerivingStrategies  #-}
{-# LANGUAGE DerivingVia, FlexibleContexts, FlexibleInstances       #-}
{-# LANGUAGE GeneralizedNewtypeDeriving, KindSignatures, LambdaCase #-}
{-# LANGUAGE MagicHash, MultiParamTypeClasses, MultiWayIf           #-}
{-# LANGUAGE NumericUnderscores, OverloadedStrings, PatternSynonyms #-}
{-# LANGUAGE RankNTypes, RecordWildCards, ScopedTypeVariables       #-}
{-# LANGUAGE StandaloneDeriving, TupleSections, TypeApplications    #-}
{-# LANGUAGE TypeFamilies, TypeInType, UnboxedTuples, ViewPatterns  #-}

import           Control.Applicative
import           Control.Exception
import           Control.Monad
import           Control.Monad.Primitive
import           Control.Monad.Reader
import           Control.Monad.ST
import           Control.Monad.State.Strict
import           Data.Bifunctor
import           Data.Bool
import qualified Data.ByteString                   as B
import qualified Data.ByteString.Builder           as B
import qualified Data.ByteString.Char8             as C
import qualified Data.ByteString.Internal          as B
import qualified Data.ByteString.Unsafe            as B
import           Data.Char
import qualified Data.Foldable                     as F
import           Data.Function
import           Data.Functor.Identity
import qualified Data.IntMap.Strict                as IM
import qualified Data.IntSet                       as IS
import qualified Data.List                         as L
import qualified Data.Map.Strict                   as M
import           Data.Monoid
import           Data.Ord
import           Data.Primitive
import           Data.Proxy
import           Data.Ratio
import           Data.Semigroup
import qualified Data.Set                          as S
import           Data.Tuple
import qualified Data.Vector                       as V
import qualified Data.Vector.Algorithms.Intro      as Intro
import qualified Data.Vector.Fusion.Stream.Monadic as MS
import qualified Data.Vector.Fusion.Bundle.Monadic as MB
import           Data.Vector.Fusion.Util
import qualified Data.Vector.Generic               as G
import qualified Data.Vector.Generic.Mutable       as GM
import qualified Data.Vector.Mutable               as VM
import qualified Data.Vector.Primitive             as P
import qualified Data.Vector.Primitive.Mutable     as PM
import qualified Data.Vector.Unboxed               as U
import qualified Data.Vector.Unboxed.Mutable       as UM
import           Debug.Trace
import           Foreign                           hiding (void)
import           GHC.Exts
import           GHC.TypeLits
import           System.IO
import           Unsafe.Coerce

#define MOD 998244353

main :: IO ()
main = do
    [n,k] <- map read.words <$> getLine
    qs <- U.unfoldrN k (runParser $ (,) <$> int <*> int) <$> C.getContents
    print $ solve n k qs

instance Semigroup IntMod where
    (<>) = (+)
instance Monoid IntMod where
    mempty = 0

solve :: Int -> Int -> U.Vector (Int, Int) -> IntMod
solve n k qs = runST $ do
    dp <- UM.replicate n 0
    UM.write dp 0 1
    ft <- newFenwickTree @IntMod (n + 100)
    mappendAt ft 0 1
    let query l r = (-) <$> mappendTo ft r <*> mappendTo ft l
    flip MS.mapM_ (stream 1 n) $ \i -> do
        U.forM_ qs $ \(l, r) -> do
            x <- query (max 0 $ i - r) (i - l + 1)
            mappendAt ft i x
            UM.unsafeModify dp (+x) i
    UM.read dp (n - 1)

-------------------------------------------------------------------------------
-- Utils
-------------------------------------------------------------------------------
rep :: (Monad m) => Int -> (Int -> m ()) -> m ()
rep n = flip MS.mapM_ (stream 0 n)
{-# INLINE rep #-}
rev :: (Monad m) => Int -> (Int -> m ()) -> m ()
rev !n = flip MS.mapM_ (streamR 0 n)
{-# INLINE rev #-}
stream :: (Monad m) => Int -> Int -> MS.Stream m Int
stream !l !r = MS.Stream step l where { step x | x < r = return $ MS.Yield x (x + 1) | otherwise = return MS.Done; {-# INLINE [0] step #-}}
{-# INLINE [1] stream #-}
streamR :: (Monad m) => Int -> Int -> MS.Stream m Int
streamR !l !r = MS.Stream step (r - 1) where { step x | x >= l = return $ MS.Yield x (x - 1) | otherwise = return MS.Done; {-# INLINE [0] step #-}}
{-# INLINE [1] streamR #-}
stream' :: (Monad m) => Int -> Int -> Int -> MS.Stream m Int
stream' !l !r !d = MS.Stream step l where { step x | x < r = return $ MS.Yield x (x + d) | otherwise = return MS.Done; {-# INLINE [0] step #-}}
{-# INLINE [1] stream' #-}
infixl 8 `shiftRL`, `unsafeShiftRL`
shiftRL :: Int -> Int -> Int
shiftRL = unsafeShiftRL
{-# INLINE shiftRL #-}
unsafeShiftRL :: Int -> Int -> Int
unsafeShiftRL (I# x#) (I# i#) = I# (uncheckedIShiftRL# x# i#)
{-# INLINE unsafeShiftRL #-}
type Parser a = StateT C.ByteString Maybe a
runParser :: Parser a -> C.ByteString -> Maybe (a, C.ByteString)
runParser = runStateT
{-# INLINE runParser #-}
int :: Parser Int
int = coerce $ C.readInt . C.dropWhile isSpace
{-# INLINE int #-}
int1 :: Parser Int
int1 = fmap (subtract 1) int
{-# INLINE int1 #-}
char :: Parser Char
char = coerce C.uncons
{-# INLINE char #-}
byte :: Parser Word8
byte = coerce B.uncons
{-# INLINE byte #-}
skipSpaces :: Parser ()
skipSpaces = modify' (C.dropWhile isSpace)
{-# INLINE skipSpaces #-}
lowerBoundM :: (Monad m) => Int -> Int -> (Int -> m Bool) -> m Int
lowerBoundM low high p = go low high where { go !low !high | high <= low = return high | otherwise = p mid >>= bool (go (mid + 1) high) (go low mid) where { mid = low + unsafeShiftRL (high - low) 1}}
{-# INLINE lowerBoundM #-}
upperBoundM :: (Monad m) => Int -> Int -> (Int -> m Bool) -> m Int
upperBoundM low high p = do { flg <- p high; if flg then return high else subtract 1 <$!> lowerBoundM low high (fmap not . p)}
{-# INLINE upperBoundM #-}
lowerBound :: Int -> Int -> (Int -> Bool) -> Int
lowerBound low high p = runIdentity (lowerBoundM low high (return . p))
{-# INLINE lowerBound #-}
upperBound :: Int -> Int -> (Int -> Bool) -> Int
upperBound low high p = runIdentity (upperBoundM low high (return . p))
{-# INLINE upperBound #-}
-------------------------------------------------------------------------------
-- Data.FenwickTree
-------------------------------------------------------------------------------
newtype FenwickTree s a = FenwickTree{getFenwickTree :: UM.MVector s a}
newFenwickTree :: (U.Unbox a, Monoid a, PrimMonad m) => Int -> m (FenwickTree (PrimState m) a)
newFenwickTree n = FenwickTree <$> UM.replicate (n + 1) mempty
{-# INLINE newFenwickTree #-}
buildFenwickTree :: (U.Unbox a, Monoid a, PrimMonad m) => U.Vector a -> m (FenwickTree (PrimState m) a)
buildFenwickTree vec = do { let { n = U.length vec}; ft <- UM.unsafeNew (n + 1); UM.write ft 0 mempty; U.unsafeCopy (UM.tail ft) vec; flip fix 1 $ \ loop !i -> when (i <= n) $ do { let { j = i + (i .&. (-i))}; when (j <= n) $ do { fti <- UM.unsafeRead ft i; UM.unsafeModify ft (<> fti) j}; loop (i + 1)}; return $ FenwickTree ft}
{-# INLINE buildFenwickTree #-}
mappendTo :: (PrimMonad m, U.Unbox a, Monoid a) => FenwickTree (PrimState m) a -> Int -> m a
mappendTo (FenwickTree ft) = go mempty where { go !acc !i | i > 0 = do { xi <- UM.unsafeRead ft i; go (acc <> xi) (i - (i .&. (-i)))} | otherwise = return acc}
{-# INLINE mappendTo #-}
sumTo :: (U.Unbox a, Num a, PrimMonad m) => FenwickTree (PrimState m) (Sum a) -> Int -> m (Sum a)
sumTo = mappendTo
{-# INLINE sumTo #-}
sumFromTo :: (U.Unbox a, Num a, PrimMonad m) => FenwickTree (PrimState m) (Sum a) -> Int -> Int -> m (Sum a)
sumFromTo ft l r = (-) <$> sumTo ft r <*> sumTo ft l
{-# INLINE sumFromTo #-}
readFenwickTree :: (PrimMonad m, U.Unbox a, Num a) => FenwickTree (PrimState m) (Sum a) -> Int -> m (Sum a)
readFenwickTree ft i = sumFromTo ft i (i + 1)
{-# INLINE readFenwickTree #-}
writeFenwickTree :: (U.Unbox a, Num a, PrimMonad m) => FenwickTree (PrimState m) (Sum a) -> Int -> (Sum a) -> m ()
writeFenwickTree ft i x = readFenwickTree ft i >>= mappendAt ft i . (x -)
{-# INLINE writeFenwickTree #-}
mappendAt :: (U.Unbox a, Semigroup a, PrimMonad m) => FenwickTree (PrimState m) a -> Int -> a -> m ()
mappendAt (FenwickTree ft) k v = flip fix (k + 1) $ \ loop !i -> do { when (i < n) $ do { UM.unsafeModify ft (<> v) i; loop $ i + (i .&. (-i))}} where { !n = UM.length ft}
{-# INLINE mappendAt #-}
addAt :: (U.Unbox a, Num a, PrimMonad m) => FenwickTree (PrimState m) (Sum a) -> Int -> Sum a -> m ()
addAt = mappendAt
{-# INLINE addAt #-}
findMaxIndexLT :: (U.Unbox a, Num a, Ord a, PrimMonad m) => FenwickTree (PrimState m) a -> a -> m Int
findMaxIndexLT (FenwickTree ft) w0 | w0 <= 0 = return 0 | otherwise = go w0 highestOneBit 0 where { n = UM.length ft; highestOneBit = until (> n) (* 2) 1 `quot` 2; go !w !step !i | step == 0 = return i | otherwise = do { if i + step < n then do { u <- UM.unsafeRead ft (i + step); if u < w then go (w - u) (step `unsafeShiftR` 1) (i + step) else go w (step `unsafeShiftR` 1) i} else go w (step `unsafeShiftR` 1) i}}
{-# INLINE findMaxIndexLT #-}
-------------------------------------------------------------------------------
-- Data.IntMod
-------------------------------------------------------------------------------
modulus :: (Num a) => a
modulus = MOD
{-# INLINE modulus #-}
infixr 8 ^%
infixl 7 *%, /%
infixl 6 +%, -%
(+%) :: Int -> Int -> Int
(I# x#) +% (I# y#) = case x# +# y# of { r# -> I# (r# -# ((r# >=# MOD#) *# MOD#))}
{-# INLINE (+%) #-}
(-%) :: Int -> Int -> Int
(I# x#) -% (I# y#) = case x# -# y# of { r# -> I# (r# +# ((r# <# 0#) *# MOD#))}
{-# INLINE (-%) #-}
(*%) :: Int -> Int -> Int
(I# x#) *% (I# y#) = case timesWord# (int2Word# x#) (int2Word# y#) of { z# -> case timesWord2# z# im# of { (# q#, _ #) -> case minusWord# z# (timesWord# q# m#) of { v# | isTrue# (geWord# v# m#) -> I# (word2Int# (plusWord# v# m#)) | otherwise -> I# (word2Int# v#)}}} where { m# = int2Word# MOD#; im# = plusWord# (quotWord# 18446744073709551615## m#) 1##}
{-# INLINE (*%) #-}
(/%) :: Int -> Int -> Int
(I# x#) /% (I# y#) = go# y# MOD# 1# 0# where { go# a# b# u# v# | isTrue# (b# ># 0#) = case a# `quotInt#` b# of { q# -> go# b# (a# -# (q# *# b#)) v# (u# -# (q# *# v#))} | otherwise = I# ((x# *# (u# +# MOD#)) `remInt#` MOD#)}
{-# INLINE (/%) #-}
(^%) :: Int -> Int -> Int
x ^% n | n > 0 = go 1 x n | n == 0 = 1 | otherwise = go 1 (1 /% x) (-n) where { go !acc !y !m | m .&. 1 == 0 = go acc (y *% y) (unsafeShiftR m 1) | m == 1 = acc *% y | otherwise = go (acc *% y) (y *% y) (unsafeShiftR (m - 1) 1)}
newtype IntMod = IntMod{getIntMod :: Int} deriving newtype (Eq, Ord, Read, Show, Real, Prim)
intMod :: (Integral a) => a -> IntMod
intMod x = fromIntegral $ mod (fromIntegral x) MOD
{-# INLINE intMod #-}
intModValidate :: IntMod -> Bool
intModValidate (IntMod x) = 0 <= x && x < MOD
{-# INLINE intModValidate #-}
instance Bounded IntMod where { minBound = IntMod 0; maxBound = IntMod $ modulus - 1}
instance Enum IntMod where { toEnum = intMod; fromEnum = coerce}
instance Integral IntMod where { quotRem x y = (x / y, x - x / y * y); toInteger = coerce (toInteger @Int)}
instance Num IntMod where { (+) = coerce (+%); (-) = coerce (-%); (*) = coerce (*%); abs = id; signum = const (IntMod 1); fromInteger x = coerce @Int @IntMod . fromInteger $ mod x modulus}
instance Fractional IntMod where { (/) = coerce (/%); fromRational q = fromInteger (numerator q) / fromInteger (denominator q)}
newtype instance  UM.MVector s IntMod = MV_IntMod (UM.MVector s Int)
newtype instance  U.Vector IntMod = V_IntMod (U.Vector Int)
instance U.Unbox IntMod
instance GM.MVector UM.MVector IntMod where { basicLength (MV_IntMod v) = GM.basicLength v; {-# INLINE basicLength #-}; basicUnsafeSlice i n (MV_IntMod v) = MV_IntMod $ GM.basicUnsafeSlice i n v; {-# INLINE basicUnsafeSlice #-}; basicOverlaps (MV_IntMod v1) (MV_IntMod v2) = GM.basicOverlaps v1 v2; {-# INLINE basicOverlaps #-}; basicUnsafeNew n = MV_IntMod `liftM` GM.basicUnsafeNew n; {-# INLINE basicUnsafeNew #-}; basicInitialize (MV_IntMod v) = GM.basicInitialize v; {-# INLINE basicInitialize #-}; basicUnsafeReplicate n x = MV_IntMod `liftM` GM.basicUnsafeReplicate n (coerce x); {-# INLINE basicUnsafeReplicate #-}; basicUnsafeRead (MV_IntMod v) i = coerce `liftM` GM.basicUnsafeRead v i; {-# INLINE basicUnsafeRead #-}; basicUnsafeWrite (MV_IntMod v) i x = GM.basicUnsafeWrite v i (coerce x); {-# INLINE basicUnsafeWrite #-}; basicClear (MV_IntMod v) = GM.basicClear v; {-# INLINE basicClear #-}; basicSet (MV_IntMod v) x = GM.basicSet v (coerce x); {-# INLINE basicSet #-}; basicUnsafeCopy (MV_IntMod v1) (MV_IntMod v2) = GM.basicUnsafeCopy v1 v2; {-# INLINE basicUnsafeCopy #-}; basicUnsafeMove (MV_IntMod v1) (MV_IntMod v2) = GM.basicUnsafeMove v1 v2; {-# INLINE basicUnsafeMove #-}; basicUnsafeGrow (MV_IntMod v) n = MV_IntMod `liftM` GM.basicUnsafeGrow v n; {-# INLINE basicUnsafeGrow #-}}
instance G.Vector U.Vector IntMod where { basicUnsafeFreeze (MV_IntMod v) = V_IntMod `liftM` G.basicUnsafeFreeze v; {-# INLINE basicUnsafeFreeze #-}; basicUnsafeThaw (V_IntMod v) = MV_IntMod `liftM` G.basicUnsafeThaw v; {-# INLINE basicUnsafeThaw #-}; basicLength (V_IntMod v) = G.basicLength v; {-# INLINE basicLength #-}; basicUnsafeSlice i n (V_IntMod v) = V_IntMod $ G.basicUnsafeSlice i n v; {-# INLINE basicUnsafeSlice #-}; basicUnsafeIndexM (V_IntMod v) i = coerce `liftM` G.basicUnsafeIndexM v i; {-# INLINE basicUnsafeIndexM #-}; basicUnsafeCopy (MV_IntMod mv) (V_IntMod v) = G.basicUnsafeCopy mv v; elemseq _ = seq; {-# INLINE elemseq #-}}


Measured memory_bytes: 8480