#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
#define rep(i,a) for(int i=0;i<(a);i++)
#define MOD 1000000007

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