a,b,c=map(int,input().split())

ans=[]
for i in range(a+1):
    for j in range(b+1):
        d=a-i+b-j
        p=10*j+i
        for k in range(1,p+1):
            if d+(p-k)%10+(p-k)//10==c:
                ans.append(k)
                break
if len(ans)==0:
    print("Impossible")
else:
    ans.sort()
    print(ans[0])