#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
	ll n, k;
	cin >> n >> k;
	vector<ll> a(n);
	vector<ll> b(k);
	for (ll i = 0; i < n; i++) cin >> a[i];
	for (ll i = 0; i < k; i++) cin >> b[i];
	ll sum = 0;
	for (ll i = 0; i < k; i++)
	{
		ll temp = count(a.begin(), a.end(), i + 1) - b[i];
		if (temp < 0) temp = 0;
		sum += temp;
	}
	cout << sum << "\n";
}