#include <iostream>
using namespace std;

int main(void){
	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;
	}

	return 0;
}