PAT (Basic Level) Practice （中文） | 1001

#include <iostream>
using namespace std;

int main() {
	int a, i = 0;
	cin >> a;
	while (a != 1) {
		if (a % 2 == 0)
			a /= 2;
		else
			a = (3 * a + 1) / 2;
		i++;
	}
	cout << i;
}