View Code of Problem 3692

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
// 1 3
// 2 6
// 3 6
int main() {
	int t;

	while (cin >> t) {
		int a[4] = { 0, 3, 6, 6 };
		if (t <= 3) cout << a[t] << endl;
		else {
			cout << 3 * 2 * (t - 3) * 3 << endl;
		}

	}
	return 0;
}