#include <bits/stdc++.h>

using namespace std;

const int INF = 1 << 30;

int N, A[18], B[18];
int dp[1 << 18][18];

int rec(int bit, int idx) {
  if(bit == (1 << N) - 1) return 0;
  if(~dp[bit][idx]) return dp[bit][idx];
  int ret = INF;
  for(int i = 0; i < N; i++) {
    if((bit >> i) & 1) continue;
    ret = min(ret, max(rec(bit | (1 << i), i), (B[idx] - A[idx]) + A[i]));
  }
  return dp[bit][idx] = ret;
}

int main() {
  cin >> N;
  for(int i = 0; i < N; i++) {
    cin >> A[i] >> B[i];
  }
  memset(dp, -1, sizeof(dp));
  int ret = INF;
  for(int i = 0; i < N; i++) ret = min(ret, rec(1 << i, i));
  cout << ret << endl;
}