#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, new_max, new_bit, A[MAX_N], B[MAX_N], DP[1 << MAX_N][MAX_N];

signed main() {
    cin >> N;
    rep(i, N) cin >> A[i] >> B[i], B[i] -= A[i];
    rep(bit, (1 << N)) rep(i, N) DP[bit][i] = INF;
    rep(bit, (1 << N)) rep(i, N) if (bit & (1 << i)) rep(j, N) if (!(bit & (1 << j))) {
        new_max = DP[bit][i] == INF ? B[i] + A[j] : max(DP[bit][i], B[i] + A[j]);
        new_bit = bit | (1 << j);
        DP[new_bit][j] = min(DP[new_bit][j], new_max);
    }
    cout << *min_element(DP[(1 << N) - 1], DP[(1 << N) - 1] + N) << endl;
}