def f(s):
    print(s // 3600, s // 60 % 60, s % 60)


def f_h(s):
    return s % (3600 * 12)


def f_m(s):
    return s % 3600 * 12


def fun(h, m):
    flg = False
    s = h * 3600 + m * 60
    for i in range(3600 * 12):
        if f_h(s) - f_m(s) >= 0:
            flg = True
        if flg and f_h(s) - f_m(s) <= 3:
            print(i)
            break
        s += 1


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