#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ll long long
#define fi first
#define se second
#define pb push_back
#define rep(i, s, n) for (int i = s; i < n; i++)
#define rrep(i, s, n) for (int i = (n)-1; i >= (s); i--)
#define all(a) a.begin(),a.end()
typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
const long long MOD = 1000000007, INF = 1e17;
 
#define endl '\n'
#define IOS() ios_base::sync_with_stdio(0);cin.tie(0)
 
template<class T>inline bool chmax(T& a,T b){if(a<b){a=b;return true;}return false;}
template<class T>inline bool chmin(T& a,T b){if(a>b){a=b;return true;}return false;}
 
template<typename T>vector<T>
make_v(size_t a){return vector<T>(a);}
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
	return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}
template<typename T,typename V>
typename enable_if<is_class<T>::value==0>::type
fill_v(T &t,const V &v){t=v;}
template<typename T,typename V>
typename enable_if<is_class<T>::value!=0>::type
fill_v(T &t,const V &v){
	for(auto &e:t) fill_v(e,v);
}

signed main()
{
	IOS();
	int N;
	cin>>N;
	if(N==1){
		cout<<0<<endl;
		return 0;
	}
	int ans = 0;
	//if(N%2==0){
		rep(i,1,N/2+1){
			if(i==1)ans+=N+N-1;
			else if(N&1&&i==N/2)ans+=i*(i+1+i+2);
			else{
				ans+=i*(N-i+(N-i+2));
			}
		}
		if(N&1)ans+=(N/2+1)*(N/2+2);
		else ans+=N/2;
		cout<<ans<<endl;
		return 0;
	//}
	cout<<ans<<endl;
}