#include <bits/stdc++.h>
using namespace std;

struct iofast_t {
    iofast_t() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} iofast;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

template <typename T, typename Compare = less<T>>
T &chmin(T &l, T r, Compare &&f = less<T>()) { return l = min(l, r, f); }
template <typename T, typename Compare = less<T>>
T &chmax(T &l, T r, Compare &&f = less<T>()) { return l = max(l, r, f); }

constexpr int lim = 1000000;

int sieve[lim + 1];

int main() {
    iota(begin(sieve), end(sieve), 0);

    for (int i = 2; i <= lim / i; ++i) {
        if (sieve[i] != i) {
            continue;
        }
        for (int j = i * i; j <= lim; j += i) {
            chmin(sieve[j], i);
        }
    }

    auto sum = [&](int x) {
        int sum = 0;

        while (1 < x) {
            auto p = sieve[x];

            int count = 0;
            while (x % p == 0) {
                x /= p;
                ++count;
            }

            sum += count;
        }

        return sum;
    };

    int n; cin >> n;

    int all = 0;
    while (n--) {
        int a; cin >> a;
        all ^= sum(a);
    }

    cout << (all != 0 ? "white" : "black") << endl;
}