#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define per(i,a,b) for(int i=(a);i>=(b);i--)
#define fi first
#define se second
#define eb emplace_back
#define popc __builtin_popcount
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pii> vp;
typedef unsigned long long ull;
typedef long double ld;

int read() {
  int x=0,w=1; char c=getchar(); 
  while(!isdigit(c)) {if(c=='-') w=-1; c=getchar();}
  while(isdigit(c)) {x=x*10+(c-'0'); c=getchar();}
  return x*w;
}

const int N=109;

int n,p[N],vst[N],ans;

signed main() {
  n=read(); ans=n;
  rep(i,1,n) p[i]=read();
  rep(i,1,n) if(!vst[i]) {
    ans--; int u=i;
    while(!vst[u]) {vst[u]=1; u=p[u];}
  }
  printf("%d\n",ans);
  return 0;
}