A, B = map(int, input().split())
if B <= 22 or 26 <= A:
    print(3)
elif A <= 23 and 25 <= B:
    print(0)
elif (A <= 23 and B == 23) or (A == 24 and B == 24) or A >= 25:
    print(2)
elif (A <= 23 and B == 24) or (A == 24 and B >= 25):
    print(1)