using static System.Math;
using System.Linq;
using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        getAns(n, a);
    }
    static void getAns(int n, int[] a)
    {
        if (n == 1) { Console.WriteLine(a[0] == 1 ? "black" : "white"); return; }
        var s = GeneratePrime(100000);
        var w = new int[n];
        for (int i = 0; i < n; i++) w[i] = calc(a[i], s);
        var x = w[0] ^ w[1];
        for (int i = 2; i < n; i++) x ^= w[i];
        Console.WriteLine(x == 0 ? "black" : "white");
    }
    static int calc(int t, List<int> s)
    {
        var p = 0;
        var count = 0;
        while (true)
        {
            if (t < s[p]) break;
            if (t % s[p] == 0)
            {
                t /= s[p];
                count++;
            }
            else p++;
        }
        return count;
    }
    static List<int> GeneratePrime(int m)
    {
        var a = new List<int>();
        int p;
        var sqrtMax = Sqrt(m);
        var s = Enumerable.Range(2, m - 1).ToList();
        do
        {
            p = s.First();
            a.Add(p);
            s.RemoveAll(n => n % p == 0);
        }
        while (p < sqrtMax);
        a.AddRange(s);
        return a;
    }
}