/**
	author:  shobonvip
	created: 2026.08.25 14:27:49
**/

#include<bits/stdc++.h>
using namespace std;

//* ATCODER
#include<atcoder/all>
using namespace atcoder;
typedef modint998244353 mint;
//*/

/* BOOST MULTIPRECISION
#include<boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecision;
//*/

typedef long long ll;

#define rep(i, s, n) for (int i = (int)(s); i < (int)(n); i++)
#define rrep(i, s, n) for (int i = (int)(n)-1; i >= (int)(s); i--)
#define all(v) v.begin(), v.end()

template <typename T> bool chmin(T &a, const T &b) {
	if (a <= b) return false;
	a = b;
	return true;
}

template <typename T> bool chmax(T &a, const T &b) {
	if (a >= b) return false;
	a = b;
	return true;
}

template <typename T> T max(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmax(ret, a[i]);
	return ret;
}

template <typename T> T min(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmin(ret, a[i]);
	return ret;
}

template <typename T> T sum(vector<T> &a){
	T ret = 0;
	for (int i=0; i<(int)a.size(); i++) ret += a[i];
	return ret;
}



void solve() {
	int n; cin >> n;

	vector<pair<pair<ll,ll>,ll>> mp;
	

	auto add = [&](ll si,ll bo,int v) -> void {
		ll g = __gcd(si,bo);
		si /= g;
		bo /= g;
		mp.emplace_back(pair(si,bo),v);
	};

	ll now = 0;

	rep(i,0,n) {
		ll l, r; cin >> l >> r;
		ll g = 1;
		while (l > g) g <<= 1;
		if (r > g && r <= 2*g) {
			now++;
			add(r,g,-1);
		}
		if (2*l >= g && 2*l <= 2*g) {
			add(2*l,g,+1);
		}
		if (2*r >= g && 2*r <= 2*g) {
			add(2*r,g,-1);
		}
		if (4*l >= g && 4*l <= 2*g) {
			add(4*l,g,+1);
		}
		if (4*r >= g && 4*r <= 2*g) {
			add(4*r,g,-1);
		}
	}

	sort(all(mp),[&](auto &a, auto &b) {
		return a.first.first * b.first.second < a.first.second * b.first.first;
	});

	ll ans = now;
	for (int i=0; i<=n;) {
		int l = i;
		ll c = 0;
		while (mp[l].first == mp[i].first) {
			c += mp[i].second;
			i++;
		}
		now += c;
		chmax(ans, now);
	}

	cout << ans << endl;
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	
	solve();
}