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

int N;

signed main(){
  cin>>N;
  int cnt = 0;
  for(int i = 0; i < 61; i ++){
    cnt += ((N & (1ll<<i)) > 0);
  }
  cout << (1ll<<cnt) - 2 << "\n";
}