N, X, M = gets.split.map(&:to_i)
A = gets.split.map(&:to_i)

B = A.map { |x|
  count = 0
  while x >= X
      count += 1
      x /= 2
  end
  count
}

max = 0
sum = 0
(0 ... N).reverse_each do |i|
    if B[i] > max
        sum += (i + 1) * (B[i] - max)
        max = B[i]
    end
end

puts (sum <= M ? "Yes" : "No")