a,b,c=map(int,input().split())
d=a+b
ans=[]
for A in range(a+1):
    for B in range(b+1):

        if d-A-B==c:
            ans+=[A+B*10]
while a>10:
    if a>10:
        a-=10
        b+=1
        d=a+b
        for A in range(a+1):
            for B in range(b+1):
                if d-A-B==c:
                    ans+=[A+B*10]
if max(ans)>0:

    print(min(ans))

else:
    print("Impossible")