#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()
int main(){
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
ll n;
cin>>n;
ll a[2*n+5],b[n+5],c[n+5];
for(ll i=1;i<=2*n;i++) cin>>a[i];
for(ll i=1;i<=n;i++) cin>>b[i];
for(ll i=1;i<=n;i++) cin>>c[i];
sort(b+1,b+n+1);
sort(c+1,c+n+1);
ll ans=(ll)1e18;
for(ll l=1;l<=n+1;l++){
vector<ll>L,R;
for(ll i=l;i<l+n;i++){
L.pb(a[i]);
}
for(ll i=1;i<=2*n;i++){
if(i<l||i>=l+n) R.pb(a[i]);
}
sort(all(L));
sort(all(R));
ll res=0;
for(ll i=0;i<n;i++){
res=max({res,abs(L[i]-b[i+1]),abs(R[i]-c[i+1])});
}
ans=min(ans,res);
res=0;
for(ll i=0;i<n;i++){
res=max({res,abs(L[i]-c[i+1]),abs(R[i]-b[i+1])});
}
ans=min(ans,res);
}
cout<<ans;
}
