#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int solve(const vector<int>& a, const vector<int>& b)
{
    int n = a.size();
    int m = b.size();

    int i = 0;
    int j = 0;
    int prev = b[0];
    int ret = 1;
    for(;;){
        while(i < n && prev <= a[i])
            ++ i;
        if(i == n)
            break;
        prev = a[i];
        ++ ret;

        while(j < m && prev <= b[j])
            ++ j;
        if(j == m)
            break;
        prev = b[j];
        ++ ret;
    }

    return ret;
}

int main()
{
    vector<vector<int> > a(2);
    for(int i=0; i<2; ++i){
        int n;
        cin >> n;
        a[i].resize(n);
        for(int j=0; j<n; ++j)
            cin >> a[i][j];
        sort(a[i].rbegin(), a[i].rend());
    }

    int ret = max(solve(a[0], a[1]), solve(a[1], a[0]));
    cout << ret << endl;

    return 0;
}