#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll maxn=51;
ll a[maxn], p[101];
inline ll read()
{
    ll x=0,f=1;
    char ch=getchar();
    while (ch<'0'||ch>'9') { if (ch=='-') f=-1; ch=getchar(); }
    while (ch>='0'&&ch<='9') x=(x<<1)+(x<<3)+(ch^48), ch=getchar();
    return x*f;
}
void getlist(ll x)
{
    for (int i=62;i>=0;--i)
    {
        if (!(x>>(ll)i)) continue;
        if (!p[i])
        {
            p[i]=x;
            break;
        }
        x^=p[i];
    }
}
int main()
{
    ll n=read(),ans;
    for (int i=1;i<=n;++i)
        getlist(a[i]=read());
    for (int i=62;i>=0;--i)
    	if ((ans^p[i])>ans)
    		ans^=p[i];
    cout<<ans;
    return 0;
}