#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
#define rep(i, n) for(int i=0;i<n;i++)
#define rep1(i, n) for(int i=1;i<=n;i++)
#define chmin(a, b) a = min(a, b)
#define chmax(a, b) a = max(a, b)

using mint=modint998244353;

int main() {
	  int n, m;
	  cin >> n >> m;
	  vector<int> b(n);
	  vector<int> cnt(m);
	  rep(i, n) {
	  	  int a;
	  	  cin >> a;
	  	  cnt[--a]++;
	  }
	  int ans = 0;
	  rep(i, m) {
	  	  int bi;
	  	  cin >> bi;
	  	  ans += max(0, cnt[i] - bi);
	  }
	  cout << ans << endl;
}