#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
#include <iomanip>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(int i = 0;i < n;++i)
bool can[6000][50000] = {};
int main() {
	can[0][0] = true;
	int n;
	cin >> n;
	for (int i = 1;i <= n;++i) {
		int a;
		cin >> a;
		for (int q = 0;q < 50000;++q) {
			can[i][a^q] = max(can[i - 1][q],can[i][a^q]);
			can[i][q] = max(can[i][q],can[i - 1][q]);
		}
	}
	int ans = 0;
	for (int q = 0;q < 50000;++q) {
		ans += can[n][q];
	}
	cout << ans << endl;
}