/* -*- coding: utf-8 -*-
 *
 * 3217.cc:  No.3217 Shiki no Shiki - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 100000;

/* typedef */

/* global variables */

int ps[MAX_N], pns[MAX_N];
bool ds1[MAX_N], ds2[MAX_N];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%d", ps + i), ps[i]--;
    if (ps[i] >= 0) pns[ps[i]]++;
  }

  for (int u = 0; u < n; u++)
    if (pns[u] == 0) ds1[ps[u]] = true;
  for (int u = 0; u < n; u++)
    if (ds1[u]) ds2[ps[u]] = true;

  int cnt = 0;
  for (int u = 0; u < n; u++) cnt += ds2[u];

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