#include <bits/stdc++.h>
using namespace std;

signed main() {
  ios::sync_with_stdio(false);
  
  int N;
  cin >> N;
  
  vector<int> A(N), B(N);
  for (int i = 0; i < N; ++i) {
    cin >> A[i] >> B[i];
  }

  vector<vector<int>> dp(1 << N, vector<int>(N, 0x3f3f3f3f));
  for (int i = 0; i < N; ++i) dp[1 << i][i] = 0;
  for (int s = 1; s + 1 < 1 << N; ++s) {
    for (int i = 0; i < N; ++i) {
      if (~s >> i & 1) continue;
      for (int j = 0; j < N; ++j) {
        if (i == j) continue;
        if (s >> j & 1) continue;
        dp[s | 1 << j][j] = min(dp[s | 1 << j][j], max(dp[s][i], B[i] - A[i] + A[j]));
      }
    }
  }

  cout << *min_element(dp.back().begin(), dp.back().end()) << endl;

  return 0;
}