#include <bits/stdc++.h>
#define ft first
#define sc second
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) {if(a<b) a=b;}
#define chmin(a, b) {if(a>b) a=b;}
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
static const ll INF=1e18;
static const ll MAX=1e5+7;
static const ll MOD=1e9+7;



ll N;
ll a[20], b[20];
ll dp[1<<18][18];

ll rec(ll s, ll S, ll v) {
  if(v!=-1 && dp[S][v]>=0) return dp[S][v];
  
  if(S==(1<<N)-1 && v==s) return 0;
  
  ll res=INF;
  for(ll u=0; u<N; u++) {
    if(S>>u&1) continue;
    
    chmin(res, max(rec(s, S|1<<u, u), b[v]+a[u]));
  }
  
  return dp[S][v]=res;
}

int main(void) {
  ll i;
  cin >> N;
  
  for(i=0; i<N; i++) {
    cin >> a[i] >> b[i];
    b[i]-=a[i];
  }
  
  ll ans=INF;
  for(i=0; i<N; i++) {
    memset(dp, -1, sizeof(dp));
    
    chmin(ans, rec(i, 0, i));
  }
  
  pt(ans);
}