a, b, c = map(int, input().split())
ans = []
for i in range(a + 1):
    for j in range(b + 1):
        d = a - i + b - j
        p = 10 * j + i
        for k in range(1, p + 1):
            if d + (p - k) % 10 + (p - k) // 10 == c:
                ans.append(k)
                break
if len(ans) == 0:
    print("Impossible")
else:
    ans.sort()
    print(ans[0])