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

total=a+b*10
ans=10**10

def  otsuri(x):
    ot_b,ot_a=divmod(x,10)
    return ot_b,ot_a

for cb in range(b+1):
    pb = cb*10
    for pa in range(a+1):
        shiharai = pa+pb
        nokorimaisu1 = (a - pa) + (b - cb) 
        for kakaku in range(1,shiharai+1):
            x = shiharai-kakaku
            ot_b , ot_a = otsuri(x)
            nokorimaisu2 = nokorimaisu1+ot_b+ot_a
            
            if nokorimaisu2 == c:
                ans=min(kakaku,ans)

if ans==10**10:
    print("Impossible")
else:
    print(ans)