def pay(a,b); a + 10 * b;end
def back(y); y / 10 + y % 10;end
  
A, B, C = gets.split.map(&:to_i)
ans = (1 .. pay(A,B)).find do |w|
  (0 .. A).find do |a|
    (0 .. B).find do |b|
      pay(a,b) >= w && (A + B - (a + b) + back(pay(a,b) - w) == C)
    end
  end
end
puts ans || :Impossible