#![allow(non_snake_case)]


fn main(){
    use proconio::marker::*;
    proconio::input!{
        n:usize,
        m:usize,
        range:[(Usize1,usize);m],
    }

    type M=ModInt998244353;
    let mut item=vec![];
    for &(a,b) in &range{
        let r=rnd::next64();
        item.push((a,r));
        item.push((b,r));
    }
    item.sort();

    let mut map=std::collections::HashMap::<u64,usize>::new();
    let mut hash=0;
    let mut i=0;

    for &(ni,r) in &item{
        *map.entry(hash).or_insert(0)+=ni-i;
        hash^=r;
        i=ni;
    }
    *map.entry(hash).or_insert(0)+=n-i;

    let mut ans=M::new(0);
    let k0=M::new(2).pow(m as u64);
    let k1=M::new(2).pow(m as u64-1);
    let k2=M::new(2).pow(m as u64-2);

    let fixed=map[&0];
    ans+=k0*fixed*fixed;

    for (&hash,&size) in &map{
        if hash!=0{
            ans+=k0*size*fixed;
            ans+=k1*size*size;
            ans+=k2*size*(n-size-fixed);
        }
    }

    println!("{ans}");
}



#[allow(unused)]
mod rnd {
    static mut X2:u32=12345;
    static mut X3:u32=0xcafef00d;
    static mut C_X1:u64=0xd15ea5e5<<32|23456;

    pub fn next()->u32{
        unsafe{
            let x=X3 as u64*3487286589;
            let ret=(X3^X2)+(C_X1 as u32^(x>>32) as u32);
            X3=X2;
            X2=C_X1 as u32;
            C_X1=x+(C_X1>>32);
            ret
        }
    }

    pub fn next64()->u64{
        (next() as u64)<<32|next() as u64
    }
}


type ModInt998244353=ModInt<998244353>;


#[derive(Clone,Copy,PartialEq,Eq,Default,Hash)]
struct ModInt<const MOD:u32>(u32);
impl<const MOD:u32> ModIntBase for ModInt<MOD>{
    fn modulus()->u32{ MOD }
    fn val(self)->u32{ self.0 }
    fn new(v:impl RemU32)->Self{ Self(v.rem_u32(MOD)) }

    fn inv(self)->Self{
        assert!(self.0!=0);

        let (mut a,mut b)=(self.0 as i64,MOD as i64);
        let (mut u,mut v)=(1,0);
        while b!=0{
            let t=a/b;
            (a,b)=(b,a-t*b);
            (u,v)=(v,u-t*v);
        }
        assert!(a==1);

        if u<0{
            u+=MOD as i64;
        }
        Self(u as u32)
    }

    fn pow(self,mut k:u64)->Self{
        let mut pow2=self;
        let mut ret=Self(1);
        while k>0{
            if k&1==1{
                ret*=pow2;
            }
            pow2*=pow2;
            k>>=1;
        }
        ret
    }
}


impl<const MOD:u32> std::fmt::Display for ModInt<MOD>{
    fn fmt(&self,f:&mut std::fmt::Formatter)->std::fmt::Result{
        write!(f,"{}",self.0)
    }
}
impl<const MOD:u32> std::fmt::Debug for ModInt<MOD>{
    fn fmt(&self,f:&mut std::fmt::Formatter)->std::fmt::Result{
        write!(f,"{}",self.0)
    }
}


impl<const MOD:u32> std::ops::Add for ModInt<MOD>{
    type Output=Self;
    fn add(self,a:Self)->Self{
        let mut new=self.0+a.0;
        if MOD<=new{
            new-=MOD;
        }
        Self(new)
    }
}
impl<const MOD:u32> std::ops::Sub for ModInt<MOD>{
    type Output=Self;
    fn sub(self,a:Self)->Self{
        let mut new=self.0-a.0;
        if 0>new as i32{
            new+=MOD;
        }
        Self(new)
    }
}
impl<const MOD:u32> std::ops::Mul for ModInt<MOD>{
    type Output=Self;
    fn mul(self,a:Self)->Self{
        Self((self.0 as u64*a.0 as u64%MOD as u64) as u32)
    }
}
impl<const MOD:u32> std::ops::Div for ModInt<MOD>{
    type Output=Self;
    fn div(self,a:Self)->Self{
        self*a.inv()
    }
}
impl<const MOD:u32> std::ops::Neg for ModInt<MOD>{
    type Output=Self;
    fn neg(self)->Self{
        if self.0==0{
            return self;
        }
        Self(MOD-self.0)
    }
}


impl<const MOD:u32> std::str::FromStr for ModInt<MOD>{
    type Err=<u64 as std::str::FromStr>::Err;
    fn from_str(s:&str)->Result<Self,Self::Err>{
        let x=s.parse::<u64>()?;
        Ok(Self::new(x))
    }
}


macro_rules! impl_modint_ops{
    ($trait:ident,$func:ident,$assign_trait:ident,$assign_func:ident,$op:tt)=>{
        impl<const MOD:u32> std::ops::$assign_trait for ModInt<MOD>{
            fn $assign_func(&mut self,a:Self){
                *self=*self $op a
            }
        }
        impl<T:RemU32,const MOD:u32> std::ops::$trait<T> for ModInt<MOD>{
            type Output=Self;
            fn $func(self,a:T)->Self{
                self $op Self::new(a)
            }
        }
        impl<T:RemU32,const MOD:u32> std::ops::$assign_trait<T> for ModInt<MOD>{
            fn $assign_func(&mut self,a:T){
                *self=*self $op Self::new(a)
            }
        }
    }
}
impl_modint_ops!(Add,add,AddAssign,add_assign,+);
impl_modint_ops!(Sub,sub,SubAssign,sub_assign,-);
impl_modint_ops!(Mul,mul,MulAssign,mul_assign,*);
impl_modint_ops!(Div,div,DivAssign,div_assign,/);


impl<const MOD:u32> std::iter::Sum for ModInt<MOD>{
    fn sum<I:Iterator<Item=Self>>(iter:I)->Self{
        iter.fold(Self(0),|sum,x|sum+x)
    }
}
impl<const MOD:u32> std::iter::Product for ModInt<MOD>{
    fn product<I:Iterator<Item=Self>>(iter:I)->Self{
        iter.fold(Self(1),|prod,x|prod*x)
    }
}


trait RemU32{
    fn rem_u32(self,m:u32)->u32;
}
macro_rules! impl_rem_u32{
    ($($ty:tt),*)=>{
        $(
            impl RemU32 for $ty{
                fn rem_u32(self,m:u32)->u32{
                    (self as i64).rem_euclid(m as i64) as _
                }
            }
        )*
    }
}
impl_rem_u32!(i32,i64);


macro_rules! impl_rem_u32{
    ($($ty:tt),*)=>{
        $(
            impl RemU32 for $ty{
                fn rem_u32(self,m:u32)->u32{
                    (self%(m as $ty)) as _
                }
            }
        )*
    }
}
impl_rem_u32!(u32,u64,usize);


trait ModIntBase:Default+std::str::FromStr+Copy+Eq+std::hash::Hash+std::fmt::Display+std::fmt::Debug
    +std::ops::Neg<Output=Self>+std::ops::Add<Output=Self>+std::ops::Sub<Output=Self>
    +std::ops::Mul<Output=Self>+std::ops::Div<Output=Self>
    +std::ops::AddAssign+std::ops::SubAssign+std::ops::MulAssign+std::ops::DivAssign
{
    fn modulus()->u32;
    fn val(self)->u32;
    fn new(v:impl RemU32)->Self;
    fn inv(self)->Self;
    fn pow(self,k:u64)->Self;
}