Lukujono

#include <iostream>

using namespace std;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int t;
	cin >> t;

	while (t--) {
		int x;
		cin >> x;

		int i = 1;

		while (1 < x && x < 4e8) {
			i++;
			if (x % 3 == 0) {
				x /= 3;
			} else {
				x = x * 2 + 1;
			}
		}

		cout << (x >= 4e8 ? -1 : i) << endl;
	}
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED