#include <bits/stdc++.h>
#define EPS 1e-9
#define INF 1070000000LL
#define MOD 1000000007LL
#define fir first
#define foreach(it,X) for(auto it=(X).begin();it!=(X).end();it++)
#define numa(x,a) for(auto x: a)
#define ite iterator
#define mp make_pair
#define rep(i,n) rep2(i,0,n)
#define rep2(i,m,n) for(int i=m;i<(n);i++)
#define pb push_back
#define pf push_front
#define sec second
#define sz(x) ((int)(x).size())
#define ALL( c ) (c).begin(), (c).end()
#define gcd(a,b) __gcd(a,b)
#define mem(x,n) memset(x,n,sizeof(x))
#define endl "\n"
using namespace std;
template <int POS, class TUPLE> void deploy(std::ostream &os, const TUPLE &tuple){}
template <int POS, class TUPLE, class H, class ...Ts> void deploy(std::ostream &os, const TUPLE &t){ os << (POS == 0 ? "" : ", ") << get<POS>(t); deploy<POS + 1, TUPLE, Ts...>(os, t); }
template <class T,class U> std::ostream& operator<<(std::ostream &os, std::pair<T,U> &p){ os << "(" << p.first <<", " << p.second <<")";return os; }
template <class T> std::ostream& operator<<(std::ostream &os, std::vector<T> &v){ int remain = v.size(); os << "{"; for(auto e: v) os << e << (--remain == 0 ? "}" : ", "); return os; }
template <class T> std::ostream& operator<<(std::ostream &os, std::set<T> &v){ int remain = v.size(); os << "{"; for(auto e: v) os << e << (--remain == 0 ? "}" : ", "); return os; }
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::map<T, K> &mp){ int remain = mp.size(); os << "{"; for(auto e: mp) os << "(" << e.first << " -> " << e.second << ")" << (--remain == 0 ? "}" : ", "); return os; }
#define DEBUG1(var0) { std::cerr << (#var0) << "=" << (var0) << endl; }
#define DEBUG2(var0, var1) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG1(var1); }
#define DEBUG3(var0, var1, var2) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG2(var1,var2); }
#define DEBUG4(var0, var1, var2, var3) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG3(var1,var2,var3); }
using ll = long long;
int Nw,Nb;
vector <int> nums,nums2;
int memo[20][20][3];

int dp_go(int x, int y, bool white){
  if (memo[x][y][white] >= 0) {
    return memo[x][y][white];
  }
  int ret = 1;
  if (white) {
    for (int next = y;next < Nb;next++) {
      if (nums2[next] > nums[x]) {
        ret = max(ret,1+dp_go(x+1,next,false));
        break;
      }
    }
  }else{
    for (int next = x; next < Nw; next++) {
      if (nums[next] > nums2[y]) {
        ret = max(ret,1+dp_go(next,y+1,true));
        break;
      }
    }
  }
  return memo[x][y][white] = ret;
}

int main()
{
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  mem(memo,-1);
  cin >> Nw;
  nums.resize(Nw);
  rep(i,Nw){
    cin >> nums[i];
  }
  cin >> Nb;
  nums2.resize(Nb);
  rep(i,Nb){
    cin >> nums2[i];
  }
  sort(ALL(nums));sort(ALL(nums2));
  int ans = 0;
  rep(i,Nw){
    rep(j,Nb){
      ans = max(ans,max(dp_go(i,j,true),dp_go(i,j,false)));
    }
  }

  cout << ans << endl;
  return 0;
}