A, B = map(int, input().split())
now = A * 3600 + B * 60

t = [0]

for i in range(1, 24):
    t.append(int(86400 / 22 * i))

res = 86400

for i in range(24):
    if t[i] >= now:
        res = min(res, t[i] - now)

print(res)