from collections import *
from itertools import *
from functools import cache, partial
from pprint import pprint
import sys
from typing import Any, Final
try:
    from icecream import ic
except ImportError:  # Graceful fallback if IceCream isn't installed.
    ic = lambda *a: None if not a else (a[0] if len(a) == 1 else a)  # noqa
debug = partial(print, file=sys.stderr)
dpprint = partial(pprint, stream=sys.stderr)
sys.setrecursionlimit(10 ** 6)
MOD=998244353

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

if L <= 295:
    language = "C++"
elif L <= 416:
    language = "Rust"
else:
    language = "Python"

ic(language)

ans = 0
for i in range(L, R + 1):
    if i <= 295:
        new_language = "C++"
    elif i <= 416:
        new_language = "Rust"
    else:
        new_language = "Python"

    if new_language != language:
        ans += 1
        language = new_language

print(ans)