#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <bitset>
#include <functional>
using namespace std;

typedef long long ll;

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