//What did I do to deserve it?!
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define endl '\n'
#define pb push_back
#define pf push_front
#define speedyboy ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define all(x) x.begin() , x.end()
#define allr(x) x.rbegin() , x.rend()
#define F first
#define S second
#define pll pair<ll , ll>
#define pss pair<string , string>
#define YES cout << "YES" << endl;
#define NO cout << "NO" << endl;
const ll sz = 5e5 + 5 , INF = 1e18 , MOD = 1e9 + 7;
ll a[sz];
vector<pll> v;
ll i , j , k;
void solve(){
ll n; cin >> n;
for(i = 1 ; i <= 2 * n ; i++) cin >> a[i];
for(i = 1 ; i <= n ; i++){
ll x;
cin >> x;
v.pb({x , 0});
}
for(i = 1 ; i <= n ; i++){
ll x;
cin >> x;
v.pb({x , 1});
}
sort(all(v));
ll mn = INF;
do{
ll mx = -INF;
bool ok = false;
for(i = 0 ; i < v.size() ; i++){
mx = max(mx , abs(v[i].F - a[i + 1]));
if(v[i].S == v[i + 1].S){
ok = true;
}
}
mn = min(mx , mn);
}while(next_permutation(all(v)));
cout << mn << endl;
}
signed main(){
speedyboy;
//open;
ll t = 1;
//cin >> t;
while(t--){
solve();
}
}
