#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    ll n;
    cin >> n;
    cout << n * (n - 1) % 998244353 << endl;

    return 0;
}