using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
//using System.Numerics;
using System.Text;
using System.Threading;

public class Solver
{
    void Solve()
    {
        int n = ReadInt();
        var a = ReadIntArray();

        int nl = n / 2;
        int nr = n - nl;

        var dl = Init<SDictionary<int, int>>(nl + 1);
        dl[0][0] = 1;
        for (int len = 1; len <= nl; len++)
        {
            for (int i = 0; i < 1 << len - 1; i++)
            {
                int s = a[0];
                int x = 0;
                for (int j = 0; j + 1 < len; j++)
                    if ((i >> j & 1) == 1)
                        s += a[j + 1];
                    else
                    {
                        x ^= s;
                        s = a[j + 1];
                    }
                x ^= s;
                dl[len][x]++;
            }
        }

        var dr = Init<SDictionary<int, int>>(nr + 1);
        dr[0][0] = 1;
        for (int len = 1; len <= nr; len++)
        {
            for (int i = 0; i < 1 << len - 1; i++)
            {
                int s = a[n - 1];
                int x = 0;
                for (int j = 0; j + 1 < len; j++)
                    if ((i >> j & 1) == 1)
                        s += a[n - j - 2];
                    else
                    {
                        x ^= s;
                        s = a[n - j - 2];
                    }
                x ^= s;
                dr[len][x]++;
            }
        }

        long ans = 0;
        foreach (var kvp in dl[nl])
            ans += 1L * kvp.Value * dr[nr][kvp.Key];

        for (int l = 0; l < nl; l++)
            for (int r = nl; r < n; r++)
            {
                int s = 0;
                for (int i = l; i <= r; i++)
                    s += a[i];
                foreach (var kvp in dl[l])
                    ans += 1L * kvp.Value * dr[n - r - 1][kvp.Key ^ s];
            }

        Write(ans);
    }

    #region Main

    protected static TextReader reader;
    protected static TextWriter writer;
    static void Main()
    {
#if DEBUG
        reader = new StreamReader("..\\..\\input.txt");
        //reader = new StreamReader(Console.OpenStandardInput());
        writer = Console.Out;
        //writer = new StreamWriter("..\\..\\output.txt");
#else
        reader = new StreamReader(Console.OpenStandardInput());
        writer = new StreamWriter(Console.OpenStandardOutput());
        //reader = new StreamReader("transform.in");
        //writer = new StreamWriter("transform.out");
#endif
        try
        {
            //var thread = new Thread(new Solver().Solve, 1024 * 1024 * 128);
            //thread.Start();
            //thread.Join();
            new Solver().Solve();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
#if DEBUG
#else
            throw;
#endif
        }
        reader.Close();
        writer.Close();
    }

    #endregion

    #region Read / Write
    private static Queue<string> currentLineTokens = new Queue<string>();
    private static string[] ReadAndSplitLine() { return reader.ReadLine().Split(new[] { ' ', '\t', }, StringSplitOptions.RemoveEmptyEntries); }
    public static string ReadToken() { while (currentLineTokens.Count == 0)currentLineTokens = new Queue<string>(ReadAndSplitLine()); return currentLineTokens.Dequeue(); }
    public static int ReadInt() { return int.Parse(ReadToken()); }
    public static long ReadLong() { return long.Parse(ReadToken()); }
    public static double ReadDouble() { return double.Parse(ReadToken(), CultureInfo.InvariantCulture); }
    public static int[] ReadIntArray() { return ReadAndSplitLine().Select(int.Parse).ToArray(); }
    public static long[] ReadLongArray() { return ReadAndSplitLine().Select(long.Parse).ToArray(); }
    public static double[] ReadDoubleArray() { return ReadAndSplitLine().Select(s => double.Parse(s, CultureInfo.InvariantCulture)).ToArray(); }
    public static int[][] ReadIntMatrix(int numberOfRows) { int[][] matrix = new int[numberOfRows][]; for (int i = 0; i < numberOfRows; i++)matrix[i] = ReadIntArray(); return matrix; }
    public static int[][] ReadAndTransposeIntMatrix(int numberOfRows)
    {
        int[][] matrix = ReadIntMatrix(numberOfRows); int[][] ret = new int[matrix[0].Length][];
        for (int i = 0; i < ret.Length; i++) { ret[i] = new int[numberOfRows]; for (int j = 0; j < numberOfRows; j++)ret[i][j] = matrix[j][i]; } return ret;
    }
    public static string[] ReadLines(int quantity) { string[] lines = new string[quantity]; for (int i = 0; i < quantity; i++)lines[i] = reader.ReadLine().Trim(); return lines; }
    public static void WriteArray<T>(IEnumerable<T> array) { writer.WriteLine(string.Join(" ", array)); }
    public static void Write(params object[] array) { WriteArray(array); }
    public static void WriteLines<T>(IEnumerable<T> array) { foreach (var a in array)writer.WriteLine(a); }
    private class SDictionary<TKey, TValue> : Dictionary<TKey, TValue>
    {
        public new TValue this[TKey key]
        {
            get { return ContainsKey(key) ? base[key] : default(TValue); }
            set { base[key] = value; }
        }
    }
    private static T[] Init<T>(int size) where T : new() { var ret = new T[size]; for (int i = 0; i < size; i++)ret[i] = new T(); return ret; }
    private static void Decrease(int[] a) { for (int i = 0; i < a.Length; i++) a[i]--; }
    #endregion
}