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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
 
    int N,M; cin >> N >> M;
    vector<int> C(M),B(M);
    while(N--){
        int a; cin >> a,a--;
        C.at(a)++;
    }
    for(auto &b : B) cin >> b;
    int answer = 0;
    for(int i=0; i<M; i++) answer += max(0,C.at(i)-B.at(i));
    cout << answer << endl;
}