#include <bits/stdc++.h>

using namespace std;

int main(void) {
  int n;
  while (cin >> n, n) {
    int ans = 0;
    while (n != 1) {
      ans++;
      if (n % 2 == 0) n /= 2;
      else n = 3 * n + 1;
    }

    cout << ans << endl;
  }

  return 0;
}
