a, b, c = map(int, input().split())
for i in range(1, a + b * 10 + 1):
    ac, bc = a, b
    q, r = divmod(i, 10)
    if r <= ac:
        ac -= r
        bc -= q
        if ac + bc == c:
            print(i)
            exit()
        if ac >= 10:
            ac -= 10
            bc += 1
            if ac + bc == c:
                print(i)
                exit()
    ac, bc = a, b
    if q + 1 <= bc:
        ac += 10 - r
        bc -= q + 1
        if ac + bc == c:
            print(i)
            exit()
print("Impossible")