import math
A, B = map(int, input().split())
if A == 24:
    angA = 0
elif A >= 12:
    angA = A - 12
else:
    angA = A
ans = 0

nowB = B * 6
nowA = angA * 30 + B * 0.5
if nowB > nowA:
    ans += (60 - B)* 60
    nowB = 0
    angA += 1
    if angA == 12:
        angA = 0
    nowA = angA * 30
    if math.isclose(((nowA - nowB) / (0.1 - (0.5/60))), int(((nowA - nowB) / (0.1 - (0.5/60)))) + 1):
        ans += int((nowA - nowB) / (0.1 - (0.5/60))) + 1
    else:
        ans += int((nowA - nowB) / (0.1 - (0.5/60)))
    print(ans)
else:
    if math.isclose(((nowA - nowB) / (0.1 - (0.5/60))), int(((nowA - nowB) / (0.1 - (0.5/60)))) + 1):
        print(int((nowA - nowB) / (0.1 - (0.5/60))) + 1)
    else:
        print(int((nowA - nowB) / (0.1 - (0.5/60))))