#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

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