#include <iostream>
using namespace std;

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