#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>

using namespace std;

#define int long long
#define rep(i,n) for(int i = 0; i < (n); i++)
#define INF ((long long)1e18)
#define MOD ((int)1e9+7)
#define endl "\n"

#define yn(f) ((f)?"Yes":"No")
#define YN(f) ((f)?"YES":"NO")

#define MAX

signed main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout<<fixed<<setprecision(10);
	
	int N;
	int ans = 0,  a = 1, b;
	
	cin>>N;
	
	a = 1;
	b = N-1;
	
	for(int i = 0; i < N; i++){
		ans += a*b;
		
		// cout<<a<<" "<<b<<endl;
		if(N%2){
			if(i%2 == 0)a += 2;
			else b -= 2;
		} else {
			if(i+1 < N/2) a += 2;
			else if(i+1 == N/2) a--;
			else a -= 2;
			if(i+1 == N/2 - 2) b--;
			else if(i+1 < N/2) b -= 2;
			else b += 2;
		}
	}
	
	if(N == 1) ans = 0;
	else if(N%2 == 1) ans += N;
	else {
		ans += 3;
		if(N == 4) ans = 21;
	}
	
	cout<<ans<<endl;
	
	
	return 0;
}