A,B,C = map(int, input().split())

if B > 0:
	A, B = A+10, B-1
if A+B <= C:
	print("Impossible")
	exit()
else:
	while A//10 and A+B-9 > C:
		A -= 10;
		B += 1
	a,b = max(0, B-C), A + min(0, B-C)
	print(a*10 + b)