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:
    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]
a+=10
while b>1:
    
    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 ans==[]:
    print("Impossible")
    exit()
if max(ans)>0:

    print(min(ans))

else:
    print("Impossible")