/* -*- coding: utf-8 -*-
 *
 * 3645.cc:  No.3645 Count Shitoshitoto Sequence - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MOD = 998244353;

/* typedef */

using ll = long long;

/* global variables */

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);

  printf("%lld\n", (ll)n * (n - 1) % MOD);

  return 0;
}