A, B, C = gets.split.map(&:to_i)
MAX_G = A + 10 * B

(1..MAX_G).each do |g|
  (0..A).each do |a|
    (0..B).each do |b|
      sum = a + 10 * b
      otsuri = sum - g

      next if otsuri < 0

      ten, one = otsuri.divmod(10)

      total = (A - a) + (B - b) + ten + one

      next if total != C

      puts g

      exit
    end
  end
end

puts 'Impossible'