#include <bits/stdc++.h>
using namespace std;

int main() {
   int n;
   cin >> n;
   int cnt = 0;
   while (n > 1) {
      if (n%2==0) {
         n/=2;
      } else {
         n++;
      }
      cnt++;
   }
   cout << cnt << endl;

   return 0;
}