#include <iostream>
using namespace std;

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

  return 0;
}