#include <iostream>
#include <cstdlib>
#include <string>

using namespace std;

int main ()
{
	const string a[] {
		"", //this is "number 0"
		"Hydrogen",
		"Helium",
		"Lithium",
		"Beryllium",
		"Boron",
		"Carbon",
		"Nitrogen",
		"Oxygen",
		"Fluorine",
		"Neon",
		"Sodium",
		"Magnesium",
		"Aluminum",
		"Silicon",
		"Phosphorus",
		"Sulfur",
		"Chlorine",
		"Argon",
		"Potassium",
		"Calcium",
		"Scandium",
		"Titanium",
		"Vanadium",
		"Chromium",
		"Manganese",
		"Iron",
		"Cobalt",
		"Nickel",
		"Copper",
		"Zinc",
		"Gallium",
		"Germanium",
		"Arsenic",
		"Selenium",
		"Bromine",
		"Krypton",
		"Rubidium",
		"Strontium",
		"Yttrium",
		"Zirconium",
		"Niobium",
		"Molybdenum",
		"Technetium",
		"Ruthenium",
		"Rhodium",
		"Palladium",
		"Silver",
		"Cadmium",
		"Indium",
		"Tin"
	};

	const size_t n {size(a)};
	int i {0};
	cout << "Pick a number between 1 and " << n - 1 << "\n";
	cin >> i;

	if (!cin){
		cerr << "Sorry I was unable to recieve any number.\n";
		return EXIT_FAILURE;

	if (i > n-1 || i < 1) {
		cerr << "Sorry, that number isnt in the accepted range.\n";
		return EXIT_FAILURE;
	}

cout << a[i] << "\n";
	return EXIT_SUCCESS;
}