#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
const int N=1e6+10;

int n;
ll now,ans;

struct LinearBasis{
    ll c[70];
    void init(){
        memset(c,0,sizeof(c));
    }

    void insert(ll x){
        for(int i=60;~i;i--){
            if(x>>i&1){
                if(!c[i])return c[i]=x,void();
                else x^=c[i];
            }
        }
    }

    bool ask(ll x){
        for(int i=60;~i;i--){
            if(x>>i&1){
                if(c[i])x^=c[i];
                else return 0;
            }
        }
        return 1;
    }
}L;

int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        ll x;scanf("%lld",&x);
        L.insert(x);
        now^=x;
    }
    for(int i=60;~i;i--){
        if(L.ask((1ll<<i)-1))ans=max(ans,now^((1ll<<(i+1))-1));
    }
    printf("%lld\n",ans);
    return 0;
}