#include<iostream>
using namespace std;

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