#include <iostream>
#include <algorithm>
#include <vector>
#define rep(i, n) for(i = 0; i < n; i++)
#define int long long
using namespace std;

signed main() {
	int n;
	cin >> n;

	int ans = 1;
	for (int i = 0; i < 60; i++) {
		if ((n >> i) % 2) ans *= 2;
	}
	ans -= 2;

	cout << ans << endl;
	return 0;
}