#include <iostream>
using namespace std;
int main(void){
	int n;
	while(cin>>n,n){
		int count = 0;
		while(n!=1){
			if(n%2==0){
				n /= 2;
			}else{
				n = 3*n + 1;
			}
			count++;
		}
		cout << count << endl;
	}
	return 0;
}