#include <bits/stdc++.h>

using namespace std;
typedef long long int ll;
typedef pair<ll,ll> pll;
typedef vector<ll> vll;

#define repi(i,a,b) for(ll i=a;i<b;i++)
#define rep(i,a) repi(i,0,a)
#define rrep(i,a) for(ll i=a-1;i>=0;i--)
#define MOD 1000000007

//debug
#define debug(arr) cerr<<#arr<<"(l"<<__LINE__<<") : ";for(auto x:arr)cerr<<x<<" ";cerr<<endl;


int main(){
  ll N;
  cin >> N;

  ll n_tmp = N;
  ll bcnt = 0;
  while(n_tmp) {
    if(n_tmp % 2 == 1) bcnt++;
    n_tmp /= 2;
  }

  ll ans = (1 << bcnt) - 2;
  cout << ans << endl;
  return 0;
}