#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main(){

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

	return 0;
}