#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0, _##i = (n); i < _##i; ++i)
#define INF 100000
#define MAX_N 20
int N, counter, res = INF, A[MAX_N], B[MAX_N], P[MAX_N];

signed main() {
    cin >> N;
    rep(i, N) cin >> A[i] >> B[i], B[i] -= A[i];
    rep(i, N) P[i] = i;
    do {
        counter = 0;
        rep(i, N - 1) counter = max(counter, B[P[i]] + A[P[i + 1]]);
        res = min(res, counter);
    } while (next_permutation(P, P + N));
    cout << res << endl;
}