A, B = map(int, input().split())
eps = 1e-10

th1 = 30 * A + 0.5 * B
if th1 >= 360:
    th1 -= 360
th2 = 6 * B
if th2 >= 360:
    th2 -= 360

if abs(th1 - th2) < eps:
    print(0)
elif th1 < th2:
    d = 360 - th2 + th1
    t = d / 5.5 * 60
    print(int(t))
else:
    d = th1 - th2
    t = d / 5.5 * 60
    print(int(t))