#include <fstream>

using namespace std;

ifstream fin("patrate2.in");
ofstream fout("patrate2.out");

int main()
{
    int N;

    fin >> N;

    if (N == 1) fout << 2 << "\n";
    else fout << 4 * N * N * N << "\n";

    fin.close();
    fout.close();

    return 0;
}