#include <iostream>
using namespace std;

int main(void){

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

}