import sys, time, random, heapq, math, itertools, copy
from collections import deque, Counter, defaultdict
from bisect import bisect, bisect_left, bisect_right
import heapq as hq
from functools import cache, cmp_to_key
def debug(*x):print('debug:',*x, file=sys.stderr)
sys.setrecursionlimit(300000)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 61 - 1
mod = 998244353
dir = [(0, 1), (0, -1), (1, 0), (-1, 0)]

L, R = mi()
ans = 0
for i in range(L, R + 1):
    if i == 295 and i < R:
        ans += 1
    if i == 416 and i < R:
        ans += 1
print(ans)