#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;
vi aa, bb;

void solve(){
    int ans = 0;

    multiset<int>sa, sb;
    while(N--){
        if(!sz(sa))sa.insert(all(aa));
        if(!sz(sb))sb.insert(all(bb));

        auto minit = sb.begin(), maxit = --sb.end();
        
        auto it = sa.lower_bound(*minit + 1);
        if(it != sa.end()){
            ans++;
            sa.erase(it);
            sb.erase(minit);
        } else{
            sa.erase(sa.begin());
            sb.erase(maxit);
        }
    }

    cout << ans << endl;
}

int main(){
    while(cin >> N){
        cin >> A;
        aa.resize(A);
        rep(i, A)scanf("%d", &aa[i]);

        cin >> B;
        bb.resize(B);
        rep(i, B)scanf("%d", &bb[i]);

        solve();
    }
}