while True:
    try:
        c, w = map(int, input().split())
    except:
        break

    sum = 0
    f = 0

    while c >= 12 or w > 12:
        e = c // 12
        c %= 12

        if w - e >= 0:
            sum += e
            f += e
            w = w - e
            c += e
        else:
            sum += w
            w = 0
            break

        c += f
        f = 0

        while c < 12 and w > 1:
            w -= 1
            c += 1

    print(sum)