#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <utility>
#include <string>
#include <algorithm>
#include <map>
#include <vector>
#include <climits>
#include <numeric>
#include<stdio.h>
#include <queue>
#include <iomanip>
#include <float.h>
#include <set>
#include<functional>
#include <stack>
#include <time.h>
#include <climits>
#include <bitset>
#include <fstream>
#include<map>
#include <cassert>
using namespace std;
long long gcd(long long a, long long b) {
	if (b == 0) return a;
	return gcd(b, a % b);
}
vector<long long> divisor(long long n) {
	vector< long long> ret;
	for (long long i = 1; i * i <= n; i++) {
		if (n % i == 0) {
			ret.push_back(i);
			if (i * i != n) ret.push_back(n / i);
		}
	}
	sort(begin(ret), end(ret));
	return (ret);
}
struct LazySegmentTree {
private:
	int n;
	vector<int> node, lazy;
	vector<bool> lazyFlag;

public:
	LazySegmentTree(vector<int> v) {
		int sz = (int)v.size();
		n = 1; while (n < sz) n *= 2;
		node.resize(2 * n - 1);
		lazy.resize(2 * n - 1, INT_MAX);
		lazyFlag.resize(2 * n - 1, false);

		for (int i = 0; i<sz; i++) node[i + n - 1] = v[i];
		for (int i = n - 2; i >= 0; i--) node[i] = min(node[i * 2 + 1], node[i * 2 + 2]);
	}

	void lazyEvaluate(int k, int l, int r) {
		if (lazyFlag[k]) {
			node[k] = lazy[k];
			if (r - l > 1) {
				lazy[k * 2 + 1] = lazy[k * 2 + 2] = lazy[k];
				lazyFlag[k * 2 + 1] = lazyFlag[k * 2 + 2] = true;
			}
			lazyFlag[k] = false;
		}
	}

	void update(int a, int b, int x, int k = 0, int l = 0, int r = -1) {
		if (r < 0) r = n;
		lazyEvaluate(k, l, r);
		if (b <= l || r <= a) return;
		if (a <= l && r <= b) {
			lazy[k] = x;
			lazyFlag[k] = true;
			lazyEvaluate(k, l, r);
		}
		else {
			update(a, b, x, 2 * k + 1, l, (l + r) / 2);
			update(a, b, x, 2 * k + 2, (l + r) / 2, r);
			node[k] = min(node[2 * k + 1], node[2 * k + 2]);
		}
	}

	int find(int a, int b, int k = 0, int l = 0, int r = -1) {
		if (r < 0) r = n;
		lazyEvaluate(k, l, r);
		if (b <= l || r <= a) return INT_MAX;
		if (a <= l && r <= b) return node[k];
		int vl = find(a, b, 2 * k + 1, l, (l + r) / 2);
		int vr = find(a, b, 2 * k + 2, (l + r) / 2, r);
		return min(vl, vr);
	}
};
#define ll long long
class UnionFind {
public:
	vector <ll> par; // 各元の親を表す配列
	vector <ll> siz; // 素集合のサイズを表す配列(1 で初期化)

					 // Constructor
	UnionFind(ll sz_) : par(sz_), siz(sz_, 1LL) {
		for (ll i = 0; i < sz_; ++i) par[i] = i; // 初期では親は自分自身
	}
	void init(ll sz_) {
		par.resize(sz_);
		siz.assign(sz_, 1LL);  // resize だとなぜか初期化されなかった
		for (ll i = 0; i < sz_; ++i) par[i] = i; // 初期では親は自分自身
	}

	// Member Function
	// Find
	ll root(ll x) { // 根の検索
		while (par[x] != x) {
			x = par[x] = par[par[x]]; // x の親の親を x の親とする
		}
		return x;
	}

	// Union(Unite, Merge)
	bool merge(ll x, ll y) {
		x = root(x);
		y = root(y);
		if (x == y) return false;
		// merge technique（データ構造をマージするテク．小を大にくっつける）
		if (siz[x] < siz[y]) swap(x, y);
		siz[x] += siz[y];
		par[y] = x;
		return true;
	}

	bool issame(ll x, ll y) { // 連結判定
		return root(x) == root(y);
	}

	ll size(ll x) { // 素集合のサイズ
		return siz[root(x)];
	}
};
struct segtree {
	int N, dat[4 * 200004];
	segtree() {}
	segtree(int n) {
		N = 1;
		while (N < n) N *= 2;
		for (int i = 0; i < 2 * N - 1; i++)
			dat[i] = INT_MAX;
	}
	// update k th element
	void update(int k, int a) {
		k += N - 1; // leaf
		dat[k] = a;
		while (k > 0) {
			k = (k - 1) / 2;
			dat[k] = min(dat[k * 2 + 1], dat[k * 2 + 2]);
		}
	}
	// min [a, b)
	int query(int a, int b) { return query(a, b, 0, 0, N); }
	int query(int a, int b, int k, int l, int r) {
		if (r <= a || b <= l) return INT_MAX;
		if (a <= l && r <= b) return dat[k];
		int m = (l + r) / 2;
		return min(query(a, b, k * 2 + 1, l, m), query(a, b, k * 2 + 2, m, r));
	}
};
struct segtree2 {
	int N, dat[4 * 200004];
	segtree2() {}
	segtree2(int n) {
		N = 1;
		while (N < n) N *= 2;
		for (int i = 0; i < 2 * N - 1; i++)
			dat[i] = INT_MIN;
	}
	// update k th element
	void update(int k, int a) {
		k += N - 1; // leaf
		dat[k] = a;
		while (k > 0) {
			k = (k - 1) / 2;
			dat[k] = max(dat[k * 2 + 1], dat[k * 2 + 2]);
		}
	}
	// min [a, b)
	int query(int a, int b) { return query(a, b, 0, 0, N); }
	int query(int a, int b, int k, int l, int r) {
		if (r <= a || b <= l) return INT_MIN;
		if (a <= l && r <= b) return dat[k];
		int m = (l + r) / 2;
		return max(query(a, b, k * 2 + 1, l, m), query(a, b, k * 2 + 2, m, r));
	}
};
long long modinv(long long a, long long m) {
	long long b = m, u = 1, v = 0;
	while (b) {
		long long t = a / b;
		a -= t * b; swap(a, b);
		u -= t * v; swap(u, v);
	}
	u %= m;
	if (u < 0) u += m;
	return u;
}
class BIT
{
public:
	vector<int> bit;
	int M;

	BIT(int M) :
		bit(vector<int>(M + 1, 0)), M(M) {}

	int sum(int i) {
		if (i <= 0)return 0;
		if (i > M)return sum(M);
		if (!i) return 0;
		return bit[i] + sum(i - (i&-i));
	}

	void add(int i, int x) {
		if (i > M) return;
		bit[i] += x;
		add(i + (i&-i), x);
	}
};
map< int64_t, int > prime_factor(int64_t n) {
	map< int64_t, int > ret;
	for (int64_t i = 2; i * i <= n; i++) {
		while (n % i == 0) {
			ret[i]++;
			n /= i;
		}
	}
	if (n != 1) ret[n] = 1;
	return ret;
}
typedef pair<int, int>p;
long long mod = 1e9 + 7;
signed main()
{
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;
	cin >> n;
	p point[100005];
	int rightmin = INT_MAX;
	int leftmax = INT_MIN;
	int ans = 0;
	vector<int>right;
	for (int i = 0; i < n; i++) {
		cin >> point[i].first >> point[i].second;
		rightmin = min(rightmin, point[i].second);
		leftmax = max(leftmax, point[i].first);
		ans = max(ans, point[i].second - point[i].first + 1);
		right.push_back(point[i].second);
	}
	for (int i = 0; i < n; i++) {
		if (point[i].first == leftmax&&point[i].second == rightmin) {
			cout << ans + rightmin - leftmax + 1;
			return 0;
		}
	}
	if (rightmin >= leftmax) {
		p rm=p(INT_MIN,rightmin);
		p lm = p(leftmax, INT_MAX);
		for (int i = 0; i < n; i++) {
			if (point[i].first == leftmax) {
				lm.second = min(lm.second, point[i].second);
			}
			if (point[i].second == rightmin) {
				rm.first = max(rm.first, point[i].first);
			}
		}
		int tmp = INT_MIN;
		for (int i = 0; i < n; i++) {
			if (point[i] != lm&&point[i] != rm) {
				tmp = max(tmp, point[i].second - point[i].first + 1);
			}
		}
		ans = max(ans, tmp + rightmin - leftmax + 1);
	}
	int num[100004] = { 0 };
	sort(right.begin(), right.end());
	map<int, int>ma;
	map<int, int>ma2;
	ma[right[0]] = 0;
	ma2[0] = right[0];
	int siz = 0;
	for (int i = 1; i < right.size(); i++) {
		if (right[i] == right[i - 1]) {
		}
		else {
			ma[right[i]] = ++siz;
			ma2[siz] = right[i];
		}
	}
	siz += 1;
	int lmax = INT_MIN;
	for (int i = 0; i < n; i++) {
		if (point[i].second == rightmin)lmax = max(lmax, point[i].first);
	}
	sort(point, point + n);
	int now = 0;
	while (point[now].first <= lmax)now += 1;
	for (int i = now; i < n; i++) {
		num[ma[point[i].second]] += 1;
	}
	int pointer = 0;
	while (num[pointer] == 0)pointer += 1;
	while (1) {
		if (lmax >= leftmax || rightmin < lmax)break;
		ans = max(ans, (rightmin -lmax + 1) + (ma2[pointer] - leftmax + 1));
		lmax = point[now].first;
		while (point[now].first <= lmax) {
			num[ma[point[now].second]] -= 1;
			now += 1; }
		while (num[pointer] == 0)pointer += 1;
	}
	cout << ans;
}

Measured memory_bytes: 11256