#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#include <utility>
#include <functional>
#include <stack>
#include <array>
#include <list>
#define popcount __builtin_popcount
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;

int main()
{
    ll n; cin>>n;
    const ll MOD=998244353;
    ll ans=(n*(n-1)/2+(n*n*(n-1)/2-n*(n-1)*(2*n-1)/6))%MOD;
    for(int i=1; i<=n-1; i++) ans=ans*i%MOD;
    cout<<ans<<endl;
    return 0;
}