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


int a[300000];
int ok[300000];


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

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

    moves = 0;
    int i = 1;
    // while there are elements to visit:
    while (ok_num > 0 && i <= n){
      
      foo = i;  
      ok_num--;   
      ok[i] = 1;

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

      i++;
    }

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

  return 0;
}