#include <stdlib.h>
#include <stdio.h>


int a[30000];
int ok[30000];


int main()
{
  int n, foo, moves;

  while(scanf(" %d", &n) == 1) {
    for (int i = 1; i <= n; i++) {
      scanf(" %d", &(a[i]));
      if (a[i] == i) ok[i] = 1;
      else ok[i] = 0;
    }
    

    moves = 0;
    // go through every element:
    for (int i = 1; i <= n; i++) {
      // if item is already a part of a cycle / solved
      if (ok[i] == 1) continue;

      foo = i;
      ok[i] = 1;
      while (a[foo] != i) {
        foo = a[foo];
        ok[foo] = 1;
        moves++;
      } 
    }

    printf("%d\n", moves);
    
  }

  return 0;
}