#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int Nw; cin >> Nw;
    vector<int> W(Nw);
    rep(i,Nw) cin >> W[i];
    sort(W.begin(), W.end());
    int Nb; cin >> Nb;
    vector<int> B(Nb);
    rep(i,Nb) cin >> B[i];
    sort(B.begin(), B.end());

    auto f = [&](vector<int> A, vector<int> B) {
        vector<int> ans = {int(1e9)};
        while(true) {
            while(!A.empty() && ans.back() <= A.back()) A.pop_back();
            if(A.empty()) break;
            ans.push_back(A.back());
            A.pop_back();

            while(!B.empty() && ans.back() <= B.back()) B.pop_back();
            if(B.empty()) break;
            ans.push_back(B.back());
            B.pop_back();
        }
        return int(ans.size()) - 1;
    };

    cout << max(f(W, B), f(B, W)) << endl;
}