#include <iostream>

using namespace std;
using ll = long long;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int N;
  cin >> N;

  for (int i = 0; ; i++) {
    if (N == 1) {
      cout << i << '\n';
      break;
    }

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