A, B = map(int, input().split())

A = min(A, 12)
A *= 5
A += 60/12 * (B/60)
if A < B:
    A += 60

#print(f'{A=} {B=}')

p = 60 / (60 ** 2)
q = 60 / (60 * 60 * 12)
ans = (A - B) / (p - q)
print(f'{ans:.0f}')