#include <iostream>
using namespace std;

int main(){
  int n;

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

  return 0;
}