L, R = map(int, input().split())
S = set()
for i in range(L, R + 1):
    if 1 <= i <= 295:
        S.add(0)
    elif 296 <= i <= 416:
        S.add(1)
    elif 417 <= i <= 420:
        S.add(2)
print(len(S) - 1)