#pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC push_options
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include<bits/stdc++.h>
#include <xmmintrin.h>
#include <immintrin.h>
using namespace::std;
__attribute__((constructor))void init(){cin.tie(0);ios::sync_with_stdio(false);cout<<fixed<<setprecision(15);}
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/priority_queue.hpp>
#include<ext/pb_ds/tag_and_trait.hpp>
// #include <boost/multiprecision/cpp_dec_float.hpp>
// #include <boost/multiprecision/cpp_int.hpp>
// namespace mp = boost::multiprecision;
// typedef mp::number<mp::cpp_dec_float<0>> cdouble;
// typedef mp::cpp_int cint;
template<typename T>using pbds=__gnu_pbds::tree<T,__gnu_pbds::null_type,less<T>,__gnu_pbds::rb_tree_tag,__gnu_pbds::tree_order_statistics_node_update>;
template<typename T>using pbds_map=__gnu_pbds::tree<T,T,less<T>,__gnu_pbds::rb_tree_tag,__gnu_pbds::tree_order_statistics_node_update>;
template<typename T,typename E>using hash_map=__gnu_pbds::gp_hash_table<T,E>;
template<typename T>using pqueue =__gnu_pbds::priority_queue<T, greater<T>,__gnu_pbds::rc_binomial_heap_tag>;
typedef long long lint;
#define INF (1LL<<60)
#define IINF (1<<30)
#define EPS (1e-10)
#define MOD 1000000007LL
//#define MOD 998244353LL
typedef vector<lint> vec;
typedef vector<vector<lint>> mat;
typedef vector<vector<vector<lint>>> mat3;
typedef vector<string> svec;
typedef vector<vector<string>> smat;
template<typename T>inline void numout(T t){bool f=0;for(auto i:t){cout<<(f?" ":"")<<i<INF/2?i:"INF";f=1;}cout<<endl;}
template<typename T>inline void numout2(T t){for(auto i:t)numout(i);}
template<typename T>inline void output(T t){bool f=0;for(auto i:t){cout<<(f?" ":"")<<i;f=1;}cout<<endl;}
template<typename T>inline void output2(T t){for(auto i:t)output(i);}
template<typename T>inline void _output(T t){bool f=0;for(lint i=0;i<t.size();i++){cout<<f?"":" "<<t[i];f=1;}cout<<endl;}
template<typename T>inline void _output2(T t){for(lint i=0;i<t.size();i++)output(t[i]);}
#define rep(i,n) for(lint i=0;i<lint(n);++i)
#define repi(i,a,b) for(lint i=lint(a);i<(lint)(b);++i)
#define rrep(i,n) for(lint i=lint(n)-1;i>=0;--i)
#define rrepi(i,a,b) for(lint i=lint(b)-1;i>=lint(a);--i)
#define irep(i) for(lint i=0;;++i)
#define all(n) begin(n),end(n)
#define dist(a,b,c,d) sqrt(pow(a-c,2)+pow(b-d,2))
inline lint gcd(lint A,lint B){return B?gcd(B,A%B):A;}
inline lint lcm(lint A,lint B){return A/gcd(A,B)*B;}
// inline cint cgcd(cint A,cint B){return B?cgcd(B,A%B):A;}
// inline cint clcm(cint A,cint B){return A/cgcd(A,B)*B;}
//inline bool chmin(auto& s,const auto& t){bool res=s>t;s=min(s,t);return res;}
//inline bool chmax(auto& s,const auto& t){bool res=s<t;s=max(s,t);return res;}
const vector<lint> dx={1,0,-1,0,1,1,-1,-1};
const vector<lint> dy={0,1,0,-1,1,-1,1,-1};
#define SUM(v) accumulate(all(v),0LL)
//auto call=[&](auto f,auto... args){return f(f,args...);};

vector<int> Z_algorizm(const auto& s){
    vector<int>res(s.size());
    res[0]=s.size();
    int i=1,j=0;
    while(i<(int)s.size()){
        while(i+j<(int)s.size()&&s[j]==s[i+j])++j;
        res[i]=j;
        if(j==0){++i;continue;}
        int k=1;
        while(i+k<(int)s.size()&&k+res[k]<j)res[i+k]=res[k],++k;
        i+=k;j-=k;
    }
    return res;
}

int main(){
    lint n;
    cin>>n;
    vec a(n),b(n);
    rep(i,n)cin>>a[i];
    mat v(max(n,61LL),vec(61,0));
    lint ans=0;
    rep(j,61){
        lint cnt=0;
        rep(i,n){
            if(a[i]&1LL<<j)cnt++;
        }
        if(cnt%2){
            ans+=1LL<<j;
            continue;
        }
        rep(i,n){
            if(a[i]&1LL<<j)v[i][j]=1;
        }
    }
    lint tmp=0;
    rep(i,n){
        tmp^=a[i];
    }
    rep(i,max(n,61LL))reverse(all(v[i]));
    lint now=0,ans2=0;
    rep(i,61){
        repi(j,now,max(61LL,n)){
            if(v[j][i]==1){
                swap(v[now],v[j]);
                break;
            }
        }
        if(v[now][i]==0)continue;
        rep(j,max(61LL,n)){
            if(now==j)continue; 
            if(v[j][i]==0)continue;
            rep(k,61){
                v[j][k]^=v[now][k];
            }
        }
        now++;
    }
    rep(i,max(61LL,n))rep(j,61){
        if(v[i][j]==1)ans2^=1LL<<(60-j);
    }
    cout<<(tmp^ans2)+ans2<<endl;
}

Measured memory_bytes: 52608