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

#ifdef DEBUG
#include "../include/debug.hpp"
#else
#define debug(...) 42
#define rdfile(...) 42
#endif

const int WHITE = 0;
const int BLACK = 1;

int flip(int color) {
    return 1 - color;
}

int count(vector<int> &W, vector<int> &B, int wi, int bi, int color, int prev) {
    if (color == WHITE) {
        while (W[wi] >= prev && wi < W.size()) wi ++;
        if (wi >= W.size()) return 0;
        return 1 + count(W, B, wi+1, bi, flip(color), W[wi]);
    } else {
        while (B[bi] >= prev && bi < B.size()) bi ++;
        if (bi >= B.size()) return 0;
        return 1 + count(W, B, wi, bi+1, flip(color), B[bi]);
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    // rdfile("_input.txt");

    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.rbegin(), W.rend());
    sort(B.rbegin(), B.rend());

    int ans = max(count(W, B, 0, 0, WHITE, 30), count(W, B, 0, 0, BLACK, 30));
    cout << ans << endl;

    return 0;
}