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

#define _p(...) (void)printf(__VA_ARGS__)
#define forr(x,arr) for(auto&& x:arr)
#define _overload3(_1,_2,_3,name,...) name
#define _rep2(i,n) _rep3(i,0,n)
#define _rep3(i,a,b) for(int i=int(a);i<int(b);++i)
#define rep(...) _overload3(__VA_ARGS__,_rep3,_rep2,)(__VA_ARGS__)
#define _rrep2(i,n) _rrep3(i,0,n)
#define _rrep3(i,a,b) for(int i=int(b)-1;i>=int(a);i--)
#define rrep(...) _overload3(__VA_ARGS__,_rrep3,_rrep2,)(__VA_ARGS__)
#define all(x) (x).begin(), (x).end()
#define bit(n) (1LL<<(n))
#define sz(x) ((int)(x).size())
#define fst first
#define snd second
using ll=long long;using pii=pair<int,int>;using vb=vector<bool>;
using vi=vector<int>;using vvi=vector<vi>;using vvvi=vector<vvi>;
using vl=vector<ll>;using vvl=vector<vl>;using vvvl=vector<vvl>;
using vd=vector<double>;using vvd=vector<vd>;using vvvd=vector<vvd>;
using vpii=vector<pii>;using vvpii=vector<vpii>;using vvvpii=vector<vvpii>;
template <typename T> T read() {T t; cin >> t; return t;}

void Main() {
  int n = read<int>();
  int a = read<int>();
  multiset<int> A, B;
  vi aa, bb;
  rep(i, a) {
    int c = read<int>();
    A.insert(c);
    aa.push_back(c);
  }
  int b = read<int>();
  rep(i, b) {
    int c = read<int>();
    B.insert(c);
    bb.push_back(c);
  }

  int ans = 0;
  while (n--) {
    if (*A.rbegin() > *B.begin()) {
      auto a_ub = A.upper_bound(*B.begin());
      auto b_lb = B.lower_bound(*a_ub);
      b_lb--;

      ans++;
      A.erase(a_ub);
      B.erase(b_lb);
    }
    else {
      A.erase(*A.begin());
      B.erase(*B.rbegin());
    }

    if (sz(A) == 0) {
      A.insert(all(aa));
    }
    if (sz(B) == 0) {
      B.insert(all(bb));
    }
  }
  cout << ans << endl;
}
int main() { cin.tie(nullptr); ios::sync_with_stdio(false); Main(); return 0; }