#include <iostream>
#include <string>
#include <math.h>
#include <algorithm>
#include <utility>
using namespace std;

int N, X=1, ans=0;

int main(){
	cin >> N;
	
	while(X<N){
		X *= 2;
		ans++;
	}
	
	ans += X-N;
	
	cout << ans << endl;
}