#include <iostream>
#include<cmath>
#include<cstdio>
#include<iomanip>
using namespace std;
int main()
{
int x;
cin>>x;
cout << x*(x+2) << endl;
}

#include <iostream>

using namespace std;

int main()
{
int x;
cin>>x;
cout << x*(x+2) << endl;
}