A, B, C = map(int, input().split())
INF = 10**18
res = INF
for i in range(A + 1):
    for j in range(B + 1):
        for k in range(1, A + 10 * B + 1):
            if i + 10 * j < k:
                continue
            r = i + 10 * j - k
            ra, rb = divmod(r, 10)
            if A - i + ra + B - j + rb == C:
                res = min(res, k)
print(res if res != INF else 'Impossible')