#include<bits/stdc++.h>
using namespace std;
#define ll long long
const int mod = 998244353;
const int N = 1e7 + 10; 
ll f[N];
signed main()
{
    f[0]=1;
    f[1]=1;
    for(int i=2;i<=N-1;i++){
        f[i]=f[i-1]*i%mod;
    }
    int n;cin>>n;
    ll ans=0;
    for(ll i=1;i<=n;i++){
        if(n-2*i+2>0){
            ll bd=1;
            for(ll j=n-2*i+2;j<=n-i;j++){
                bd=bd*j%mod;
            }
            ans=ans+f[n-i]*bd%mod;
        }
    }
    cout<<ans;
    
}