#include <bits/stdc++.h>
using namespace std;
using ll = long long;

#include<atcoder/modint>
using namespace atcoder;
using mint = modint998244353;
vector<mint> fact, factinv, inv;
const ll mod = 998244353;
void prenCkModp(ll n) {
    fact.resize(n + 5);
    factinv.resize(n + 5);
    inv.resize(n + 5);
    fact[0] = fact[1] = 1;
    factinv[0] = factinv[1] = 1;
    inv[1] = 1;
    for (ll i = 2; i < n + 5; i++) {
        fact[i] = (fact[i - 1] * i);
        inv[i] = mod - (inv[mod % i] * (mod / i));
        factinv[i] = (factinv[i - 1] * inv[i]);
    }

}

mint nCk(ll n, ll k) {
    if (n < k||k<0) return 0;
    return fact[n] * (factinv[k] * factinv[n - k]);
}

int main() {

    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll N;
    cin>>N;
    if(N<4){
        cout<<0<<endl;
        return 0;
    }
    mint an=0;
    prenCkModp(N);
    for(int x=2;N-x>=2;x++){
        mint res=fact[N];
        res*=factinv[x-2]*factinv[N-x-2]*inv[N-1]*inv[x]*inv[N-x];
        an+=res*res;
    }
    cout<<an.val()<<endl;
    
}