#include <bits/stdc++.h>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace std;

typedef long long ll;

int main() {
    ll n;
    cin >> n;
    ll bit = __builtin_popcountll(n);
    ll ans = (1LL << bit) - 2;
    cout << ans << endl;
}