#include<iostream>
using namespace std;
#define int  long long
#define MOD 1000000007

signed main(){
  int n,ans=1LL;
  cin>>n;
  if(n>=MOD){
    cout<<0<<endl;
    return 0;
  }
  for(int i=1;i<=n;i++) (ans*=i)%=MOD;
  cout<<ans<<endl;
  return 0;
}