from bisect import bisect_left

lst = [0]
for i in range(1, 11):
    lst.append(12 * 60 * 60 * i / 11)
lst.append(12 * 60 * 60)
a, b = map(int, input().split())
a %= 12
sec = a * 60 * 60 + b * 60

print(int(lst[bisect_left(lst, sec)] - sec))