#include <iostream>
#include <vector>
#include <algorithm>
#include <print>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m;
    if (!(cin >> n >> m)) return 0;

    vector<int> count(m + 1, 0);
    for (int i = 0; i < n; ++i) {
        int a;
        cin >> a;
        count[a]++;
    }

    vector<int> b(m + 1);
    for (int j = 1; j <= m; ++j) {
        cin >> b[j];
    }

    int ans = 0;
    for (int j = 1; j <= m; ++j) {
        if (count[j] > b[j]) {
            ans += (count[j] - b[j]);
        }
    }

    std::println("{}", ans);

    return 0;
}