#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>
#include <iomanip>
#include <limits>
#include <chrono>
#include <random>
#include <array>
#include <unordered_map>
#include <functional>
#include <complex>

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

const long long MAX = 5100000;
const long long INF = 1LL << 60;
const long long mod = 1000000007LL;
//const long long mod = 998244353LL;

using namespace std;
typedef unsigned long long ull;
typedef long long ll;

ll N;
vector<ll> a, b;
ll full;
vector<vector<ll>> dp;
ll dfs(ll S, ll last) {
	if (last == -1) {
		ll res = INF;
		for (ll i = 0; i < N; i++) {
			chmin(res, dfs(S | (1 << i), i));
		}
		return res;
	}
	if (S == full) {
		return 0;
	}
	if (dp[S][last] != -1) return dp[S][last];
	ll res = INF;
	for (ll i = 0; i < N; i++) {
		if (!(S >> i & 1)) {
			chmin(res, max(dfs(S | (1 << i), i) , b[last] - a[last] + a[i]));
		}
	}
	return dp[S][last] = res;
}
int main()
{
	/*
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	*/
	scanf("%lld", &N);
	a.resize(N), b.resize(N); for (ll i = 0; i < N; i++) scanf("%lld %lld", &a[i], &b[i]);
	full = (1 << N) - 1;
	dp = vector<vector<ll>>(full, vector<ll>(N, -1));
	cout << dfs(0, -1) << endl;
	return 0;
}