/* -*- coding: utf-8 -*-
 *
 * 3648.cc:  No.3648 Overbooked Meeting Rooms - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 500;
const int MAX_M = 500;

/* typedef */

/* global variables */

int as[MAX_N], bs[MAX_M], cs[MAX_M];

/* subroutines */

/* main */

int main() {
  int n, m;
  scanf("%d%d", &n, &m);
  for (int i = 0; i < n; i++) scanf("%d", as + i), as[i]--;
  for (int i = 0; i < m; i++) scanf("%d", bs + i);

  for (int i = 0; i < n; i++) cs[as[i]]++;

  int sum = 0;
  for (int i = 0; i < m; i++) sum += max(0, cs[i] - bs[i]);

  printf("%d\n", sum);
  
  return 0;
}