import java.util.*;

import java.io.*;

public class SelectionSort {

public void Select(int[] arr,int n){

int swaps = 0;

int tmp;

for(int i = 0; i< arr.length-1; i++) {

while(arr[i]!=i+1) {

tmp = arr[arr[i]-1];

arr[arr[i]-1] = arr[i];

arr[i] = tmp;

swaps++;

}

}

System.out.println(swaps);

}

public static void main(String[] args){

Scanner sc = new Scanner(System.in);

int n = sc.nextInt();

int a[] = new int[n];

for(int i = 0 ; i < n ; i++){

a[i] = sc.nextInt();

}

SelectionSort sct = new SelectionSort();

sct.Select(a,n);

}

}