#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
int main(){
  int N;
  cin >> N;
  long long ans = 1;
  for (int i = 1; i <= N; i++){
    ans *= i;
    ans %= MOD;
  }
  ans *= N;
  ans %= MOD;
  ans *= N - 1;
  ans %= MOD;
  ans *= 499122177;
  ans %= MOD;
  long long sub = 0;
  for (int i = 0; i < N - 1; i++){
    sub += (long long) i * (N - 1 - i) * 2;
    sub %= MOD;
  }
  sub *= N - 1;
  sub %= MOD;
  for (int i = 1; i <= N - 2; i++){
    sub *= i;
    sub %= MOD;
  }
  ans += MOD - sub;
  ans %= MOD;
  cout << ans << endl;
}