#include <bits/stdc++.h>

using ll = std::int64_t;

int main(){
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    ll N;
    std::cin >> N;

    ll res = (1ll << __builtin_popcountll(N)) - 2;
    std::cout << res << std::endl;
}