#include <iostream>
#include <vector>
using namespace std;

#define rep(i, n) for (int i = 0; i < n; i++)

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;
    vector<int> a(n), b(n);
    rep(i, n) cin >> a[i] >> b[i];

    vector<vector<int>> dist(n, vector<int>(n));
    rep(i, n) rep(j, n) if (i != j) dist[i][j] = b[i] - a[i] + a[j];

    vector<vector<int>> dp(1 << n, vector<int>(n, 1e9));
    rep(i, n) dp[1 << i][i] = 0;

    rep(i, 1 << n)
    {
        rep(to, n) rep(from, n)
        {
            if (i >> to & 1)
            {
                dp[i][to] = min(dp[i][to],
                                max(dp[i - (1 << to)][from], dist[from][to]));
            }
        }
    }

    int ans = 1e9;
    rep(i, n) ans = min(ans, dp.back()[i]);
    cout << ans << endl;

    return 0;
}