#include<iostream>

using namespace std;

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