#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;

int N, A, B;

int main(){
    cin >> N >> A;
    deque<int> aa(A);
    rep(i, A)cin >> aa[i];
    cin >> B;
    deque<int> bb(B);
    rep(i, B)cin >> bb[i];

    sort(all(aa));
    sort(all(bb), greater<int>());

    int ans = 0;
    deque<int> aaa, bbb;
    rep(i, N){
        if(!sz(aaa))aaa = aa;
        if(!sz(bbb))bbb = bb;

        bool win = false;
        rep(i, sz(aaa)){
            rep(j, sz(bbb)){
                if(aaa[i] > bbb[j]){
                    win = true;
                    ans++;
                    aaa.erase(aaa.begin() + i);
                    bbb.erase(bbb.begin() + j);
                    break;
                }
            }
            if(win)break;
        }
        if(!win){
            aaa.pop_front();
            bbb.pop_front();
        }
    }
    cout << ans << endl;
}