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

#define ll long long
#define vvi vector<vector<int>>
#define vec vector
#define pq priority_queue
#define all(v) (v).begin(), (v).end()
#define rep(i, n, m) for (int (i) = (n); (i) < (m); ++(i))
#define debug(x) cerr << #x << ": " << x << endl;
#define debug2(x, y) cerr<<"("<<#x<<", "<<#y<<") = "<<"("<<x<<", "<<y<<")"<<endl;
#define debugB(x, y) cerr<<#x<<": "<<bitset<y>(x) << endl;
#define line() cerr << "---------------" << endl;

const int dx[] = {1, -1, 0, 0};
const int dy[] = {0, 0, -1, 1};


int main() {
   ll n;
   cin >> n;
   ll x = 1;
   ll cnt = 0;
   while (1) {
      if (x == n) break;
      if (x*2-1 > n) {
         x--;
      } else {
         x*=2;
      }
      cnt++;
   }
   cout << cnt << endl;

   return 0;
}