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

okn = a+b*10

for i in range(1,okn+1):
    if i % 10 <= a:
        kk = (a-(i%10))+b-(i//10)
        if kk == c:
            print(i)
            exit()
    if i % 10 != 0:
        if (i//10)+1 <= b:
            kk = b-((i//10)+1) + a + (10-(i%10))
            if kk == c:
                print(i)
                exit()
    for j in range(2):
        ryo = i+10*(j+1)
        if ryo <= a:
            kk = a-ryo+j+1+b
            if kk == c:
                print(i)
                exit()

print("Impossible")