#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 += 1;
    }
    ++cnt;
  }
  cout<<cnt<<endl;
}