#include <iostream>
using namespace std;

int main() {
    int n;
  
    while (cin >>n) { 
	   //考虑特殊情况：n为0
 		if(n==0)break;
        int sum=0;
        while(n!=1)
        {
            if(n%2==0){
                n/=2;sum++;
            }
            else{
                n=(n*3+1)/2;
                sum++;
 
            }

        }
        cout<<sum<<endl;
        
    }
}