#include<bits/stdc++.h> using namespace std; long long n,ans; int main(){ //freopen("donimoes.in","r",stdin); //freopen("donimoes.out","w",stdout); cin>>n; if(n<=2){ cout<<0; return 0; } ans=n-1; ans%=998244353ll; ans*=(n-2)%998244353ll; ans%=998244353ll; cout<<ans; return 0; }