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