a,b,c=map(int,input().split())
def calc(v,x,y):
    z=x*10+y-v
    return a-x+b-y+(z//10+z%10)
ans='Impossible'
for i in range(1,b*10+a+1):
    for j in range(b+1):
        for k in range(a+1):
            if calc(i,j,k)==c:
                ans=i
                break
        else:continue
        break
    else:continue
    break
print(ans)