#include <bits/stdc++.h>
using namespace std;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

int main() {
    int64_t n; cin >> n;
    int64_t m = int64_t(1) << (bitset<64>(n).count() - 1);

    int64_t ans = 0, cnt = 0;
    for (int i = 0; i < 64; ++i) {
        if (!(n & (int64_t(1) << i))) continue;
        ans |= !!(m & (int64_t(1) << cnt++)) * (int64_t(1) << i);
    }

    cout << ans << endl;
}