#include <iostream>
#include <vector>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <cstdio>
#include <bitset>
#include <queue>
#include <deque>
#include <algorithm>
#include <numeric>
#include <cassert>
#include <functional>
#include <stack>
#include <cmath>
#include <string>
#include <complex>
#include <cassert>
#define REP(i, N) for (int i = 0; i < (int)N; i++)
#define FOR(i, a, b) for (int i = a; i < (int)b; i++)
#define ALL(x) (x).begin(), (x).end()

using namespace std;

constexpr int mod = 998244353;

template <int mod>
struct ModInt {
  int x;
  ModInt() : x(0) {}
  ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}
  ModInt& operator+=(const ModInt& p) {
    if ((x += p.x) >= mod) x -= mod;
    return *this;
  }
  ModInt& operator-=(const ModInt& p) {
    if ((x += mod - p.x) >= mod) x -= mod;
    return *this;
  }
  ModInt& operator*=(const ModInt& p) {
    x = (int)(1LL * x * p.x % mod);
    return *this;
  }
  ModInt& operator/=(const ModInt& p) {
    *this *= p.inverse();
    return *this;
  }
  ModInt operator-() const { return ModInt(-x); }
  ModInt operator+(const ModInt& p) const { return ModInt(*this) += p; }
  ModInt operator-(const ModInt& p) const { return ModInt(*this) -= p; }
  ModInt operator*(const ModInt& p) const { return ModInt(*this) *= p; }
  ModInt operator/(const ModInt& p) const { return ModInt(*this) /= p; }
  ModInt inverse() const {
    int a = x, b = mod, u = 1, v = 0, t;
    while (b > 0) {
      t = a / b;
      swap(a -= t * b, b);
      swap(u -= t * v, v);
    }
    return ModInt(u);
  }
  ModInt pow(int64_t n) const {
    ModInt ret(1), mul(x);
    while (n > 0) {
      if (n & 1) ret *= mul;
      mul *= mul;
      n >>= 1;
    }
    return ret;
  }
  friend ostream& operator<<(ostream& os, const ModInt& p) { return os << p.x; }
  friend istream& operator>>(istream& is, ModInt& a) {
    int64_t t;
    is >> t;
    a = ModInt<mod>(t);
    return (is);
  }
  static int get_mod() { return mod; }
};

using modint = ModInt<mod>;

template <typename T>
struct BinaryIndexedTree {
  vector<T> data;

  BinaryIndexedTree(int sz) { data.assign(++sz, 0); }

  T sum(int k) {
    T ret = 0;
    for (++k; k > 0; k -= k & -k) ret += data[k];
    return (ret);
  }

  void add(int k, T x) {
    for (++k; k < data.size(); k += k & -k) data[k] += x;
  }
};

int main() {
  int N, M;
  cin >> N >> M;
  int R = N - M;
  vector<int> A(N, -1), used(N), cum(N + 1);
  REP(i, M) {
    int P, K;
    cin >> P >> K;
    A[K - 1] = P - 1;
    used[P - 1] = 1;
  }
  vector<int> rest;
  REP(i, N) {
    if (!used[i]) rest.push_back(i);
    cum[i + 1] = cum[i] + (A[i] == -1);
  }
  vector<modint> facts(N + 1, 1);
  FOR(i, 2, N + 1) facts[i] = facts[i - 1] * i;
  BinaryIndexedTree<int> bit(N + 1);
  modint ans = facts[R] * R * (R - 1) / 4;
  int B = 0;
  REP(i, N) {
    if (A[i] != -1) {
      int C = rest.end() - lower_bound(ALL(rest), A[i]);
      ans += facts[R - 1] * (C * cum[i] + (R - C) * (cum[N] - cum[i + 1]));
      ans += facts[R] * (i - cum[i] - bit.sum(A[i]));
      bit.add(A[i], 1);
    }
  }
  cout << ans << endl;
  return 0;
}