#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
  long long n;
  cin >> n;

  int res = 0;

  while (n > 1) {
    if (n % 2 == 1) {
      n++;
    } else {
      n /= 2;
    }
    res++;
  }
  cout << res << endl;
}