#include<bits/stdc++.h>
#define REP(i,n) for(int i=0;i<(n);i++)
#define ALL(v) (v).begin(),(v).end()
#define int long long

using namespace std;
typedef pair<int,int> P;

//-----------------------------------------------------------------------

signed main()
{   
    cin.tie(0);
    ios::sync_with_stdio(false);

    int n; cin>>n;

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

}