#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
const int INF = 1 << 30;

int getresult(vector<int> W, vector<int> B, bool wfirst) {
    int res = 0;
    int w_idx = W.size() - 1;
    int b_idx = B.size() - 1;
    int cur = INF;
    bool w_flag = wfirst;
    while (true) {
        if ((w_flag && w_idx < 0) || (!w_flag && b_idx < 0)) break;
        if (w_flag) {
            if (W[w_idx] < cur) {
                cur = W[w_idx];
                ++res;
                --w_idx;
                w_flag = !w_flag;
            } else {
                --w_idx;
            }
        }
        if (!w_flag) {
            if (B[b_idx] < cur) {
                cur = B[b_idx];
                ++res;
                --b_idx;
                w_flag = !w_flag;
            } else {
                --b_idx;
            }
        }
    }    
    return res;
}

int main() {
    int Nw, Nb;
    cin >> Nw;
    vector<int> W(Nw);
    for (int i = 0; i < Nw; ++i) cin >> W[i];
    cin >> Nb;
    vector<int> B(Nb);
    for (int i = 0; i < Nb; ++i) cin >> B[i];

    sort(W.begin(), W.end());
    sort(B.begin(), B.end());

    cout << max(getresult(W, B, true), getresult(W, B, false)) << endl;
}