#include <iostream>
#include <cstdlib>
#include "atom.h"
using namespace std;

int main()
{
	const atom<1> h;
	const atom<2> he;
	const atom<8> o;

	cout <<  "H belongs to period " << atom<1>::period() << ".\n";
	cout << "He belongs to period " << atom<2>::period() << ".\n";
	cout <<  "O belongs to period " << atom<8>::period() << ".\n";

	return EXIT_SUCCESS;
}