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

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

    long long N; cin >> N;
    int one = 0;
    for(int i=0; i<60; i++) if(N&(1LL<<i)) one++;

    long long answer = 1;
    while(one--) answer *= 2;
    cout << answer-2 << endl;
}