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

sec_short = 360 /12 / 60 / 60
sec_long = 360 / 60 / 60
diff_v= sec_long - sec_short


short_dig = 360 * (a % 12) / 12 + 30 * b / 60
long_dig = 360 * b / 60
#print(sec_short)
#print(sec_long)
#print(short_dig, long_dig)

diff = short_dig - long_dig
if diff < 0:
    diff += 360

print(int(diff / diff_v + 0.0001))