/* -*- coding: utf-8 -*-
 *
 * 771.cc:  No.771 しおり - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 18;
const int NBITS = 1 << MAX_N;
const int INF = 1 << 30;

/* typedef */

/* global variables */

int as[MAX_N], bs[MAX_N];
int dp[NBITS][MAX_N];

/* subroutines */

inline void setmin(int &a, int b) { if (a > b) a = b; }

/* main */

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) scanf("%d%d", as + i, bs + i);

  int nbits = 1 << n;
  for (int bits = 0; bits < nbits; bits++)
    fill(dp[bits], dp[bits] + n, INF);
  for (int i = 0, bi = 1; i < n; i++, bi <<= 1) dp[bi][i] = 0;

  for (int bits = 1; bits < nbits; bits++)
    for (int i = 0; i < n; i++)
      for (int j = 0, bj = 1; j < n; j++, bj <<= 1)
	if (! (bits & bj))
	  setmin(dp[bits | bj][j], max(dp[bits][i], bs[i] - as[i] + as[j]));

  int mind = INF;
  for (int i = 0; i < n; i++)
    setmin(mind, dp[nbits - 1][i]);
  printf("%d\n", mind);
  return 0;
}