#include <iostream>
#include <cstdio>

using namespace std;


int main() {

  int n;

  while(1) {

  cin >> n;
  if(n == 0) break;

  int count = 0;

  while(n != 1) {

    count ++;

    if(n % 2 == 0) n /= 2;
    else n = 3*n +1;
    
  }

  cout << count << endl;

  }

  return 0;

}