from sys import maxsize as inf


def f2(a, aa, b, bb, p):
    diff = 10 * b + a - p
    bi = bb - b + diff // 10
    ai = aa - a + diff % 10
    return ai, bi


def f1(aa, bb):
    res = inf
    s = set()
    for a in range(aa + 1):
        for b in range(bb + 1):
            for p in range(1, 1 + min(10 * b + a, p_max)):
                ai, bi = f2(a, aa, b, bb, p)
                if ai + bi == c:
                    res = min(res, p)
    if res == inf:
        return "Impossible"
    return res


a, b, c = map(int, input().split())
p_max = 10 * b + a
print(f1(a, b))