#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <list>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <cmath>
#include <utility>
#include <sstream>
#include <queue>
#include <queue>

using namespace std;

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

  int64_t n;
  cin >> n;
  int popcnt = 0;
  while (n > 0LL) {
    if (n & 1LL == 1LL) {
      ++popcnt;
    }
    n >>= 1LL;
  }
  int64_t ans = (1LL << popcnt) - 2LL;
  cout << ans << endl;
  return 0;
}