from fractions import Fraction
from collections import defaultdict

n = int(input())
d = defaultdict(int)


now = 0
for i in range(n):
	l, r = map(int,input().split())
	g = 1
	while g < l: g *= 2
	#print(g,l,r)

	assert l <= g
	assert 2*l > g
	if r >= g and r <= 2*g:
		now += 1
		d[Fraction(r, g)] -= 1

	if 2*l >= g and 2*l <= 2*g:
		d[Fraction(2*l, g)] += 1

	if 2*r >= g and 2*r <= 2*g:
		d[Fraction(2*r, g)] -= 1

	if 4*l >= g and 4*l <= 2*g:
		d[Fraction(4*l, g)] += 1

	if 4*r >= g and 4*r <= 2*g:
		d[Fraction(4*r, g)] -= 1

ans = now
for i, c in sorted(d.items()):
	now += c
	#print(i,c,now)
	ans = max(ans, now)

print(ans)