#include <bits/stdc++.h>
#include<atcoder/all>
using namespace atcoder;
using namespace std;
using ll = long long;
using mint = modint998244353;
int main() {
    ll N;
    cin>>N;
    mint an=N;
    cout<<(an*(an-1).pow(N)-an*(an-1)*(an-3).pow(N-2)).val()<<endl;
}