#include <bits/stdc++.h>
#define For(i, a, b) for(long long i = a; i < b; i++)
#define rep(i, n) For(i, 0, n)
#define rFor(i, a, b) for(long long i = a; i >= b; i--)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;
using ld = long double;

int INF = 2000000000;
lint LINF = 1000000000000000000;

int main() {
    int n;
    cin >> n;
    multiset<int> a;
    rep(i, n) {
        int x;
        cin >> x;
        a.insert(x);
    }
    int m;
    cin >> m;
    multiset<int> b;
    rep(i, m) {
        int x;
        cin >> x;
        b.insert(x);
    }
    auto f = [](multiset<int> s, multiset<int> t) {
        int now = 0;
        vector<int> v = {-1};
        while (true) {
            bool add = false;
            if (now == 0) {
                auto it = s.upper_bound(v.back());
                if (it != s.end()) {
                    int x = *it;
                    v.emplace_back(x);
                    s.erase(s.find(x));
                    add = true;
                    now ^= 1;
                }
            } else {
                auto it = t.upper_bound(v.back());
                if (it != t.end()) {
                    int x = *it;
                    v.emplace_back(x);
                    t.erase(t.find(x));
                    add = true;
                    now ^= 1;
                }
            }
            if (!add) {
                break;
            }
        }
        return (int)v.size() - 1;
    };
    cout << max(f(a, b), f(b, a)) << endl;
}