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

signed main(){
    ios::sync_with_stdio(false);
	cin.tie(0);
 
    ll n;
    cin>>n;
    int ans=0;
    while(n!=1){
        if(n%2) n++,ans++;
        n/=2;
        ans++;
    }
    cout<<ans<<endl;
}