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

rad_a = a % 12 * 30 + b / 2
rad_b = b * 6
rad_d = rad_a - rad_b
if rad_d < 0:
    rad_d += 360
diff = 1 / 10 - 30 / (60 * 60)
print(int(rad_d / diff + 10e-5))