#include<iostream>
using namespace std;

int main(){

  int n;
  int count;

  while( cin >> n ){
    if(n==0){break;}

    count=0;

    while(n!=1){
      if(n%2==0)
	n/=2;
      else
	n=n*3+1;
      
      count ++;
    }
    
    cout << count << endl;
  }


  return 0;
}