/* -*- coding: utf-8 -*-
 *
 * 3631.cc:  No.3631 Collatz conjecture - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int cnt = 0;
  while (n != 1) {
    if (n & 1) n = n * 3 + 1;
    else n /= 2;
    cnt++;
  }

  printf("%d\n", cnt);
  
  return 0;
}