#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)

int main(){
  int n;
  cin >> n;
  vector<int> cnt(n);
  rep(i,n){
    int x;
    cin >> x;
    for (int j = 2; j*j <= x;j++){
      while(x%j == 0){
        x/=j;
        cnt[i]++;
      }
    }
    if (x != 1) cnt[i]++;
  }
  int ans = 0;
  for (int i = 0; i < n;i++){
    ans ^= cnt[i];
  }
  if (ans != 0) cout << "white" << endl;
  else cout << "black" << endl;
  return 0;
}