import sys
import math
import itertools

def fermat_prime_and_combi():
    ferm = [1] + [(2**(2**m))+1 for m in range(5)]
    liste = set()
    for i in range(len(ferm)):
        for p in itertools.combinations(ferm,i):
            r = 1
            for elt in p:
                r *= elt
            liste.add(r)
    return liste

a, b = [int(i) for i in input().split()]
result = 0
p2 = 0

def is_mult_pow_2(n):
    res = (int(n) & int(n-1)) == 0
    return res
# Write an action using print
# To debug: print("Debug messages...", file=sys.stderr)
fermat_p = fermat_prime_and_combi()
last_traitement = set()
en_cours = []

for x in range(b, a-1, -1):
    en_cours = [x]
    while True:
        if x in last_traitement:
            result += 1
            break
        elif is_mult_pow_2(x):
            result += 1
            last_traitement.update(en_cours)
            break
        elif x in fermat_p:
            result += 1
            last_traitement.update(en_cours)
            break
        elif x%2 == 0:
            x = x/2
            en_cours = en_cours  + [x]
        else:
            break

print(result)