#include<bits/stdc++.h>
#define il inline
#define x first
#define y second
#define sd std::
#define op operator
#define de(yh) #yh,'=',yh
#define ast(yx,bk) ((yx)||(clg("AST ",__LINE__,'\n',de(bk)),exit(7),7))
#define fr(js) freopen(#js".in","r",stdin),freopen(#js".out","w",stdout)
using LL=long long;using pii=sd pair<int,int>;
#define rd(js) sd cin>>js
template<class js>il bool cn(js&y,js x){return y>x?y=x,true:false;}template<class js>il bool cx(js&y,js x){return y<x?y=x,true:false;}
template<class yx>il int wrt(yx js){return sd cout<<js,7;}template<class J,class...S>il int wrt(J y,S...x){return wrt(y),wrt(x...),7;}
#ifdef Bella
template<class yx>il int clg(yx js){return sd cerr<<js,7;}
#else
template<class yx>il int clg(yx js){return 7;}
#endif
template<class J,class...S>il int clg(J y,S...x){return clg(y),clg(x...),7;}
const int N=33;
int n,d[N];
il void Init()
{
  rd(n);
  for(int i=0,x;i<n;++i)
  {
    rd(x);
    for(int i=30;~i;--i) if(x>>i&1)
    {
      if(d[i]) x^=d[i];
      else
      {
        d[i]=x;
        break;
      }
    }
  }
  LL ans=0,cnt=-1;
  for(int i=30;~i;--i) ans|=d[i],cnt+=!!d[i];
  wrt(ans*(1ll<<cnt));
  return;
}
il void Solve()
{
  return;
}
// Wonder what you're doing for the rest of your life ?
main()
{
#ifdef Bella
  fr(1);
#elif ONLINE_JUDGE
#else
  fr(BK0717);
#endif
  sd ios::sync_with_stdio(0),sd cin.tie(0),sd cout.tie(0);
  int T=1;
  for(;T--;Init(),Solve());
#ifdef Bella
  clg('\n',1e3*clock()/CLOCKS_PER_SEC,"ms\n","BK, What? Why? How?\n");
#endif
  return 0;
}
/*
g++ 7.cpp -o 7 -std=c++14 -O2 -lm -Wall -Wshadow -DBella
*/