A, B, C = map(int, input().split())

L = []
for i in range(-10, A+1):
    for j in range(-10, B+1):
        if A-i + B-j == C and i + 10*j > 0:
            L += [i + 10*j]

print(min(L) if len(L) != 0 else 'Impossible')