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.append([i, j])

l2 = []
for i, j in l:
    if i + 10*j > 0:
        l2.append(i + 10*j)

if len(l2) == 0:
    print('Impossible')
else:
    print(min(l2))