#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, a, b) for (ll i = a; i < b; ++i)
#define rrep(i, a, b) for (ll i = a; i >= b; --i)

// --- 初期設定（入出力の高速化と小数15桁出力） ---
struct Init {
  Init() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(15);
  }
} init;
// ------------------------------------------------

int main() {
  int n, m;
  cin >> n >> m;
  vector<int> room(m);
  rep(i, 0, n) {
    int inp;
    cin >> inp;
    --inp;
    ++room[inp];
  }

  ll ans = 0;
  rep(i, 0, m) {
    int b;
    cin >> b;
    int over = room[i] - b;
    if (over > 0) {
      ans += over;
    }
  }

  cout << ans << "\n";
  return 0;
}