Shared code

#include<bits/stdc++.h>
using namespace std;
 
typedef long long int ll;
#define IOS ios_base::sync_with_stdio(0);  cin.tie(0); cout.tie(0);
 
typedef pair<int,int>pr;
#define all(i)     i.begin() , i.end()
#define ft     first
#define sn     second
#define pb push_back
 
const int mod = 1e9+7;
#define en "\n"
#define dbg cout<<"rony\n";
 
#define MAXN 1000010
 
int D[MAXN];
ll f(ll n)
{
  if(n == 1) return 0;
  if(n == 2) return 1;
 
  if(D[n] != -1) return D[n];
  int an;
  an = ((f(n - 2) + f(n - 1)) % mod);
  an = (an * (n - 1))%mod;
 
  return D[n] = an;
}
void solve()
{
  int n;
  cin >> n;
  
  for(int i = 0;i <= n;i++) D[i] = -1;
 
  cout<<f(n)%mod<<endl;
} 
 
int main()
{
    IOS;
    int t;
  // cin >> t;
  t = 1;
    while ( t-- )
    {
 
        solve();
    }
    return 0;
}