#include <bits/stdc++.h>
using namespace std;
#define rep(i, x, limit) for (long long i = (long long)x; i < (long long)limit; i++)
#define REP(i, x, limit) for (long long i = (long long)x; i <= (long long)limit; i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define el '\n'
#define spa " "
#define Yes cout << "Yes" << el
#define No cout << "No" << el
#define YES cout << "YES" << el
#define NO cout << "NO" << el
#define eps (1e-10)
#define Equals(a,b) (fabs((a) - (b)) < eps )
#define debug(x) cerr << #x << " = " << x << el
using ll = long long;
using ull = unsigned long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using vi = vector<int>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vs = vector<string>;
using vb = vector<bool>;
const double pi = 3.141592653589793238;
const int inf = 1073741823;
const ll infl = 1LL << 60;
const string ABC = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string abc = "abcdefghijklmnopqrstuvwxyz";
const ll MOD = 998244353;
#include<atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using vm = vector<mint>;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll n,m;cin>>n>>m;
  multiset<ll> st;
  rep(i,0,n){
    ll s;cin>>s;
    st.insert(s);
  }
  vl T(m);
  ll ans=0;
  auto ST=st;
  rep(i,0,m)cin>>T[i];
  for(auto t:T){
    auto it=st.lower_bound(t);
    if(it==st.end())break;
    ans++;
    st.erase(it);
  }
  if(ans==0){
    cout<<0<<el;
    return 0;
  }
  vl TT(T.begin(),T.begin()+ans);
  ll l=-1,r=inf;
  while(r-l>1){
    ll m=(l+r)/2;
    auto st=ST;
    bool f=true;
    for(auto t:TT){
      auto it=st.lower_bound(t+m);
      if(it==st.end()){
        f=false;
        break;
      }
      st.erase(it);
    }
    if(f)l=m;
    else r=m;
  }
  cout<<l<<el;
}