I,X,n=map(int,input().split())
I,X=I+10*X,0
if I+X<=n: print("Impossible"); exit
else:
	while I//10 and I+X-9>n: I-=10; X+=1
	a,b=max(0,X-n),I+min(0,X-n)
	print(a*10+b)