#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define fore(i, a) for(auto &i:a)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
#define yes "YES"
#define no "NO"
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;

int main() {
    fastcin;
    int nw, nb, t;
    vi w, b;
    cin >> nw;
    rep(i, 0, nw) {
        cin >> t;
        w.push_back(t);
    }
    cin >> nb;
    rep(i, 0, nb) {
        cin >> t;
        b.push_back(t);
    }
    VSORT(w);
    VSORT(b);
    int crr = MOD, ans1 = 0, ans2 = 0;
    while(1) {
        int tmp = crr;
        rrep(i, nw-1, 0) {
            if(w[i]<crr) {
                crr = w[i];
                ans1++;
                break;
            }
        }
        if(crr==tmp) break;
        tmp = crr;
        rrep(i, nb-1, 0) {
            if(b[i]<crr) {
                crr = b[i];
                ans1++;
                break;
            }
        }
        if(crr==tmp) break;
    }
    crr = MOD;
    while(1) {
        int tmp = crr;
        rrep(i, nb-1, 0) {
            if(b[i]<crr) {
                crr = b[i];
                ans2++;
                break;
            }
        }
        if(crr==tmp) break;
        tmp = crr;
        rrep(i, nw-1, 0) {
            if(w[i]<crr) {
                crr = w[i];
                ans2++;
                break;
            }
        }
        if(crr==tmp) break;
    }
    print(max(ans1, ans2));
    return 0;
}