require 'prime'

# https://yukicoder.me/submissions/174004
@dp={}
def guchoku216(aa,turn=true)
    return !turn if aa.size == 0
    
    aa.sort!
    return @dp[aa+[turn]] if @dp[aa+[turn]]
    
    aa.each_index{|i|
        ac = aa.clone
        ac[i]-=1
        while ac[i] > 0
            return @dp[aa+[turn]] = turn if (guchoku216(ac.clone,!turn) == turn)
            ac[i]-=1
        end
        ac.delete(0)
        return @dp[aa+[turn]] = turn if (guchoku216(ac.clone,!turn) == turn)
    }
    return @dp[aa+[turn]] = !turn
end

def game(n)
    guchoku216(n.prime_division.map{|e|e[1]})
end

n = gets.to_i
puts guchoku216(gets.split.map(&:to_i).map{|e| e.prime_division.map{|e|e[1]}}.flatten!) ? 'white' : 'black'