#include <cstring>
#include <fstream>

using namespace std;

struct Trie
{
    Trie* son[2];
    Trie()
    {
        memset(son, 0, sizeof(son));
    }
};
Trie* T = new Trie;

void Tinsert(Trie* now, int number, int K)
{
    if (K < 0) return;

    int aux = ((number & (1 << K)) != 0 ? 1 : 0);
    if (now->son[aux] == 0)
    {
        Trie* noda = new Trie;
        now->son[aux] = noda;
    }

    Tinsert(now->son[aux], number, K - 1);
}

int N, V[100002];
int result;

int main()
{
    ifstream fin("xormax.in");
    ofstream fout("xormax.out");

    fin >> N;
    for (int i = 1; i <= N; ++i)
    {
        fin >> V[i];
        V[i] ^= V[i - 1];
    }

    Tinsert(T, 0, 20);
    for (int i = 1; i <= N; ++i)
    {
        Trie* now = T;
        int resnow = 0;

        for (int j = 20; j >= 0; --j)
        {
            int aux = !(((V[i] & (1 << j)) != 0 ? 1 : 0));
            if (now->son[aux] != 0)
            {
                resnow |= (1 << j);
                now = now->son[aux];
            }
            else now = now->son[!aux];
        }

        if (resnow > result) result = resnow;

        Tinsert(T, V[i], 20);
    }

    fout << result;

    fin.close();
    fout.close();
}