#include <bits/stdc++.h>

#define FOR(i,a,b) for (ll i=(a);i<(ll)(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define SUM(v) accumulate(ALL(v),0ll)
#define CL(v) cout<<v<<endl
using ll = long long;
const ll INF=10101010;
const ll mod=1e9+7;
using namespace std;
using P = pair<int,int>;
ll pom(ll a,ll n,int m){ll x=1;for(a%=m;n;n/=2)n&1?x=x*a%m:0,a=a*a%m;return x;}
class UnionFind {
public:
    vector <ll> par; 
    vector <ll> siz;

    // Constructor
    UnionFind(ll sz_): par(sz_), siz(sz_, 1LL) {
        for (ll i = 0; i < sz_; ++i) par[i] = i; 
    }
    void init(ll sz_) {
        par.resize(sz_);
        siz.assign(sz_, 1LL); 
        for (ll i = 0; i < sz_; ++i) par[i] = i; 
    }

    // Member Function
    // Find
    ll root(ll x) { // 根の検索
        while (par[x] != x) {
            x = par[x] = par[par[x]];
        }
        return x;
    }

    // Union(Unite, Merge)
    bool merge(ll x, ll y) {
        x = root(x);
        y = root(y);
        if (x == y) return false;
      
        if (siz[x] < siz[y]) swap(x, y);
        siz[x] += siz[y];
        par[y] = x;
        return true;
    }

    bool issame(ll x, ll y) { 
        return root(x) == root(y);
    }

    ll size(ll x) {
        return siz[root(x)];
    }
};
ll gcd(ll a,ll b)
{
  if(a==0)return b;
  return gcd(b%a,a);
}


//--------------------------------//mod


int main()
{  
    ll n;
    cin>>n;
    ll ans=0;
    REP(i,100)
    {
        if((1LL<<i)<=n)
        {
            ans=i;
        }
        else break;
    }
    ll k=n-(1LL<<ans);
    cout<<ans+2+k<<endl;
    return 0;
}