def fun(h, m):
    flg = False
    s = h * 3600 + m * 60
    for i in range(2 * 3600):
        s %= 12 * 3600
        if s in set(i * 12 * 3600 // 11 for i in range(11)):
            return i
        s += 1


a, b = map(int, input().split())
print(fun(a, b))