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

rad_a = ((a / 12 + b / 60 * (1 / 12)) * 360) % 360
rad_b = b / 60 * 360 % 360
rad_d = rad_a - rad_b
if rad_d < 0:
    rad_d += 360

# 長
# 60秒で1 / 60 * 360ド
# 1秒で1/10ド
# 短:
# 60秒で1 / (12 * 60) * 360ド
# 1秒で1 / (12 * 60 * 60) * 360

diff = 1 / 10 - 30 / (60 * 60)
print(int(rad_d / diff + 0.5))