#include <bits/stdc++.h>
#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=101010;
static const ll MOD=1e9+7;

ll mem[1<<18][22];
ll N;
ll a[22], b[22];

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

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