#include <bits/stdc++.h>
using namespace std;
// #include <atcoder/all>
// using namespace atcoder;

/* alias */
using ull = unsigned long long;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vi = vector<int>;
using vll = vector<long long>;
using vd = vector<double>;
using vs = vector<string>;
using vb = vector<bool>;
using vpii = vector<pair<int, int>>;
using vpll = vector<pair<ll, ll>>;
using vvi = vector<vector<int>>;
using vvll = vector<vector<long long>>;
using vvd = vector<vector<double>>;
using vvs = vector<vector<string>>;
using vvb = vector<vector<bool>>;
template<typename T> using min_priority_queue = priority_queue<T, vector<T>, greater<T>>;

/* define */
#define MOD 998244353
// #define MOD 1000000007
#define INF (1LL << 60)
#define elif else if
#define pb push_back
#define pf push_front
#define fi first
#define se second
#define all(obj) (obj).begin(), (obj).end()
#define YESNO(bool) cout << (bool ? "YES\n" : "NO\n")
#define YesNo(bool) cout << (bool ? "Yes\n" : "No\n")
#define yesno(bool) cout << (bool ? "yes\n" : "no\n")
template<class T> bool chmax(T &a, const T &b) {if(a<b){ a=b; return 1;} return 0;}
template<class T> bool chmin(T &a, const T &b) {if(b<a){ a=b; return 1;} return 0;}
#define debug(x) cerr << #x << ":" << x << "\n";

/* REP macro */
#define reps(i, a, n) for(ll i = (a); i < (n); i++)
#define rep(i, n) reps(i, 0, (n))
#define rrep(i, n) reps(i, 1, (n + 1))
#define repd(i, n) for(ll i = (n - 1); i >= 0; i--)
#define rrepd(i, n) for(ll i = (n); i >= 1; i--)
#define fore(i, a) for(auto &i: a)

/* vector */
template<class T> T vmax(vector<T> &array){ T ret = array[0]; for(T a: array) chmax(ret, a); return ret; }
template<class T> T vmin(vector<T> &array){ T ret = array[0]; for(T a: array) chmin(ret, a); return ret; }
template<class T> T sum(vector<T> &array){ T ret = 0; for(T a:array) ret += a; return ret; }
template<class T> void list_set(vector<T> &array){ sort(all(array)); array.erase(unique(all(array)),array.end()); }
template<class T> int bisect_left(vector<T> &array, T key){ return lower_bound(all(array),key) - array.begin(); }
template<class T> int bisect_right(vector<T> &array, T key){ return upper_bound(all(array),key) - array.begin(); }

/* string */
ll string_to_ll(string n){ ll ret = 0, k = 1; while(n.length() > 0){ ret += k * (n.back() - '0'); n.pop_back(); k *= 10; } return ret; }
string ll_to_string(ll n){ string ret = ""; while(n > 0){ ret.pb((n % 10) + '0'); n /= 10; } reverse(all(ret)); return ret; }

struct popopo{ popopo(){ cin.tie(0); ios::sync_with_stdio(0); cout << fixed << setprecision(15); }; } popopoppo;

// n = 1,...,N に対して、n % A < B を満たすものの数 
ll Count_of_n_mod_A_less_than_B(ll N, ll A, ll B){ return N / A * min(A, B) + min(N % A, B - 1); }


/* IN/OUT */
int scan() { return getchar(); }
void scan(int &a) { cin >> a; }
void scan(long long &a) { cin >> a; }
void scan(char &a) { cin >> a; }
void scan(double &a) { cin >> a; }
void scan(string &a) { cin >> a; }
template <class T, class S> void scan(pair<T, S> &p) { scan(p.first), scan(p.second); }
template <class T> void scan(vector<T> &);
template <class T> void scan(vector<T> &a) { for(auto &i : a) scan(i); }

void IN(){}
template<class Head, class... Tail> void IN(Head& head, Tail &...tail){ scan(head); IN(tail...); }

#define INT(...) int __VA_ARGS__; IN(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__; IN(__VA_ARGS__)
#define STR(...) string __VA_ARGS__; IN(__VA_ARGS__)
#define VEC(type, name, size) vector<type> name(size); IN(name)
#define VECS(type, name, size) vector<type> name(size + 1); for(int i = 1; i <= size; i++) scan(name[i])

void OUT(){ cout << "\n"; }
template<class T> void output(T a){ cout << a; }
template<class T> void output(vector<T> v){ for(int i = 0; i < v.size(); i++) cout << v[i] << (i == v.size() - 1 ? "" : " "); }
template<class Head, class... Tail> void OUT(const Head &head, const Tail &...tail) { output(head); if(sizeof...(tail)) cout << " "; OUT(tail...); }

void FLASH(){ cout << endl; }
template<class Head, class... Tail> void FLASH(const Head  &head, const Tail &...tail) { output(head); if(sizeof...(tail)) cout << " "; FLASH(tail...); }


template<int m> struct StaticModint{
    using mint = StaticModint;
  public:
    static constexpr int mod() { return m; }
    static mint raw(int v) {
        mint x;
        x._v = v;
        return x;
    }

    StaticModint() : _v(0) {}
    template <class T>
    StaticModint(T v) {
        long long x = (long long)(v % (long long)(umod()));
        if (x < 0) x += umod();
        _v = (unsigned int)(x);
    }

    unsigned int val() const { return _v; }

    mint& operator++() {
        _v++;
        if (_v == umod()) _v = 0;
        return *this;
    }
    mint& operator--() {
        if (_v == 0) _v = umod();
        _v--;
        return *this;
    }
    mint operator++(int) {
        mint result = *this;
        ++*this;
        return result;
    }
    mint operator--(int) {
        mint result = *this;
        --*this;
        return result;
    }

    mint& operator+=(const mint& rhs) {
        _v += rhs._v;
        if (_v >= umod()) _v -= umod();
        return *this;
    }
    mint& operator-=(const mint& rhs) {
        _v -= rhs._v;
        if (_v >= umod()) _v += umod();
        return *this;
    }
    mint& operator*=(const mint& rhs) {
        unsigned long long z = _v;
        z *= rhs._v;
        _v = (unsigned int)(z % umod());
        return *this;
    }
    mint& operator/=(const mint& rhs) { return *this = *this * rhs.inv(); }

    mint operator+() const { return *this; }
    mint operator-() const { return mint() - *this; }

    mint pow(long long n) const {
        assert(0 <= n);
        mint x = *this, r = 1;
        while (n) {
            if (n & 1) r *= x;
            x *= x;
            n >>= 1;
        }
        return r;
    }
    mint inv() const {
        assert(_v);
        return pow(umod() - 2);
    }

    friend mint operator+(const mint& lhs, const mint& rhs) { return mint(lhs) += rhs;}
    friend mint operator-(const mint& lhs, const mint& rhs) { return mint(lhs) -= rhs; }
    friend mint operator*(const mint& lhs, const mint& rhs) { return mint(lhs) *= rhs; }
    friend mint operator/(const mint& lhs, const mint& rhs) { return mint(lhs) /= rhs; }
    friend bool operator==(const mint& lhs, const mint& rhs) { return lhs._v == rhs._v; }
    friend bool operator!=(const mint& lhs, const mint& rhs) { return lhs._v != rhs._v; }

    friend ostream &operator<<(ostream &os, mint x) {
        os << x.val();
        return (os);
    }

  private:
    unsigned int _v;
    static constexpr unsigned int umod() { return m; }

};

using Modint998244353 = StaticModint<998244353>;
using Modint1000000007 = StaticModint<1000000007>;

using Mint = Modint998244353;

template<class T> struct Enumeration{
  public:
    Enumeration(int sz = 0) { update(sz); }

    T fact(int k) {
        update(k);
        return _fact[k];
    }

    T finv(int k) {
        update(k);
        return _finv[k];
    }

    T inv(int k) {
        update(k);
        return _inv[k];
    }

    T nPk(int n, int k) {
        if(k < 0 || n < k) return 0;
        return fact(n) * finv(n - k);
    }

    T nCk(int n, int k) {
        if(k < 0 || n < k) return 0;
        return fact(n) * finv(k) * finv(n - k);
    }

    T nHk(int n, int k) {
        if(n < 0 || k < 0) return 0;
        if(n == 0) return 1;
        else return nCk(n + k - 1, k);
    }

    T Catalan(int n){
        return nCk(2*n, n) - nCk(2*n, n-1);
    }

  private:
    vector<T> _fact, _finv, _inv;

    void update(int sz) {
        if(_fact.size() < sz + 1){
            int pre_sz = max(1, (int)_fact.size());
            _fact.resize(sz + 1, T(1));
            _finv.resize(sz + 1, T(1));
            _inv.resize(sz + 1, T(1));
            for(int i = pre_sz; i <= (int)sz; i++) {
                _fact[i] = _fact[i - 1] * T(i);
            }
            _finv[sz] = T(1) / _fact[sz];
            for(int i = (int)sz - 1; i >= pre_sz; i--) {
                _finv[i] = _finv[i + 1] * T(i + 1);
            }
            for(int i = pre_sz; i <= (int)sz; i++) {
                _inv[i] = _finv[i] * _fact[i - 1];
            }
        }
    }

};

template<class M> struct Segtree {
  public:
    using S = typename M::T;

    Segtree() : Segtree(0) {}
    Segtree(int n) : Segtree(vector<S> (n, M::e())) {}
    Segtree(const vector<S> &v) : n(int(v.size())) { 
        while((1 << log) < n) log++;
        size = 1 << log;
        d = vector<S> (2 * size, M::e());
        for(int i = 0; i < n; i++) d[size + i] = v[i];
        for(int i = size- 1; i >= 1; i--) update(i);
    }

    void set(int p, S x){
        assert(0 <= p && p < n);
        p += size;
        d[p] = x;
        for(int i = 1; i <= log; i++) update(p >> i);
    }

    S get(int p){
        assert(0 <= p && p < n);
        return d[p + size];
    }

    S prod(int l, int r){
        assert(0 <= l && l <= r && r <= n);
        S sml = M::e(), smr = M::e();
        l += size; r += size;
        while(l < r){
            if(l & 1) sml = M::op(sml, d[l++]);
            if(r & 1) smr = M::op(d[--r], smr);
            l >>= 1; r >>= 1;
        }
        return M::op(sml, smr);
    }

    S all_prod(){ return d[1]; }


  private:
    int n, size, log = 0;
    vector<S> d;
    void update(int k){ d[k] = M::op(d[k * 2], d[k * 2 + 1]); }

};

struct Add_M {    
    using T = long long;
    static T e() { return 0; }
    static T op(T x, T y) { return x + y; }
};


int main() {

    LL(N, M);    
    vll P(M), K(M);
    vll T(N + 1, -1);
    rep(i, M) {
        LL(p, k);
        P[i] = p;
        K[i] = k;
        T[k] = p;
    }

    Enumeration<Mint> enu(101010);   
    auto f = [&](ll n) -> Mint {
        Mint res = enu.fact(n);
        res *= Mint(n) * Mint(n - 1) / Mint(4);
        return res;
    };

    Mint base = f(N - M);

    set<ll> sP;
    for (auto s : P) sP.insert(s);
    Segtree<Add_M> seg(N + 1);
    for (int i = 1; i <= N; i++) {
        if (sP.find(i) == sP.end()) {
            seg.set(i, 1);
        }
    }


    Mint add = 0;
    ll n = N - M;
    ll hole = 0;
    for (int i = 1; i <= N; i++) {
        if (T[i] != -1) {
            ll big = seg.prod(T[i], N + 1);
            ll sml = n - big;

            Mint u = enu.fact(n - sml);
                // OUT(hole);
            add += u;
                // OUT(u);

        } else {
            hole++;
        }
    }

    OUT(base + add);
    


}