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:
            L += [[i, j]]

L2 = []
for i, j in L:
    if i + 10*j > 0:
        L2 += [i + 10*j]

print(min(L2) if len(L2) != 0 else 'Impossible')