a,b,c = map(int,input().split())
for i in range(1, 10*b+a+1):
    for j in range(a+1):
        for k in range(b+1):
            if k*10+j < i:
                continue
            t = 10*k+j - i
            tb = t//10
            ta = t - tb*10
            if ta+tb+(b-k)+(a-j)==c:
                print(i)
                exit()
print('Impossible')