L, R = map(int, input().split())

l, r = 0, 0
if L < 296:
    l = 0
elif L < 417:
    l = 1
else:
    l = 2
if R < 296:
    r = 0
elif R < 417:
    r = 1
else:
    r = 2

print(r-l)