#include <iostream>
#define int long long
using namespace std;
typedef long long LL;
const int N = 100010;
int n, a[N];
signed main() {
    scanf("%d", &n);
    for (int i = 0; i < n; i++) scanf("%lld", &a[i]);
    int k = 0;
    for (int i = 62; i >= 0; i--) {
        for (int j = k; j < n; j++)
            if (a[j] >> i & 1) {
                swap(a[j], a[k]);
                break;
            }
        if (!(a[k] >> i & 1)) continue;
        for (int j = 0; j < n; j++)
            if (j != k && (a[j] >> i & 1))
                a[j] ^= a[k];
        k++;
        if (k == n) break;
    }
    int res = 0;
    for (int i = 0; i < k; i++) res ^= a[i];
    printf("%lld\n", res);
    return 0;
}