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

using ll=long long;
#define int ll

#define rng(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,b) rng(i,0,b)

#define bg begin()
#define ed end()
#define pb push_back
#define all(x) x.bg,x.ed

template<class t>using vc=vector<t>;
template<class t>using vvc=vc<vc<t>>;

template<class t,class u>bool chmin(t&a,u b){
	if(a>b){a=b;return true;}
	else return false;
}
template<class t,class u>bool chmax(t&a,u b){
	if(a<b){a=b;return true;}
	else return false;
}

bool add(vc<ll>&a,ll x){
	for(auto v:a)chmin(x,x^v);
	if(x)a.pb(x);
	return x;
}

void slv(){
	int n,tot=0;cin>>n;
	vc<ll> b;
	rep(i,n){
		int x;cin>>x;
		tot^=x;
		add(b,x);
	}
	int ans=tot;
	rep(len,61){
		ll mask=(1LL<<len)-1;
		vc<ll> c;
		for(auto v:b)add(c,v&mask);
		if(!add(c,mask))chmax(ans,tot^((1LL<<(len+1))-1));
	}
	cout<<ans<<endl;
}

signed main(){
	cin.tie(0);
	ios::sync_with_stdio(0);
	
	slv();
}