/* -*- coding: utf-8 -*-
 *
 * 2853.cc:  No.2853 A + B Problem - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int BN = 60;

/* typedef */

using ll = long long;

/* global variables */

/* subroutines */

/* main */

int main() {
  ll n;
  scanf("%lld", &n);

  int c = 0;
  for (; n > 0; n >>= 1)
    if (n & 1) c++;

  printf("%lld\n", (1LL << c) - 2);
  
  return 0;
}