#include <bits/stdc++.h>
using namespace std;

int have[2234567];

signed main(){
  int n;cin>>n;
  vector<int> w(n);
  for(int i=0;i<n;i++)cin>>w[i];
  sort(w.begin(),w.end());
  int m;cin>>m;
  vector<int> v(m);
  for(int i=0;i<m;i++)cin>>v[i];
  sort(v.begin(),v.end());
  int ans1=1,ans2=1;
  for(int i=0,j=0;i<n&&j<m;){
    while(j<m&&w[i]>=v[j])j++;
    if(j<m){
      ans1++;
      while(i<n&&w[i]<=v[j])i++;
      if(i<n)ans1++;
    }
  }
  swap(v,w);
  swap(n,m);
  swap(ans1,ans2);
  for(int i=0,j=0;i<n&&j<m;){
    while(j<m&&w[i]>=v[j])j++;
    if(j<m){
      ans1++;
      while(i<n&&w[i]<=v[j])i++;
      if(i<n)ans1++;
    }
  }
  cout<<max(ans1,ans2)<<endl;
}