#include<iostream>
using namespace std;

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