a, b, c = map(int, input().split())

A = []
for i in range(b + 1):
    for j in range(a + 1):
        for k in range(1, i * 10 + j + 1):
            if c == k // 10 + k % 10 + b - i + a - j:
                if i * 10 + j - k:
                    A.append(i * 10 + j - k)

print(min(A) if A else "Impossible")