# frozen_string_literal: true

A, B, C, D = gets.chomp.split.map(&:to_i)

if D >= 10
  puts 'Impossible'
else
  puts 'Possible'

  score_bar = [50] * B + [100] * A
  (1..10).each do |j|
    (100 * j..100 * j + 99).each do |i|
      break if score_bar[i].nil?

      score_bar[i] *= 2**j
    end
  end

  puts score_bar.sum
end