def f(n)
  n / 10 + n % 10
end

A, B, C = gets.split.map &:to_i

puts (1..A+B*10).find{|n|
  (0..A).any?{|i|
    (0..B).any?{|j|
      next if i + j * 10 < n
      z = A - i + B - j + f((i + j * 10) - n)
      z == C
    }
  }
} || :Impossible