import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author cteam037
 */
public class Monsters {

    int counter = 0;
    //int[] t;
    int[] c;
    int n = 0;

    void run() {
        //Scanner sc = new Scanner(System.in);
        
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try {
            Scanner sc = new Scanner(System.in);
            
            while (sc.hasNext()) {
                n = sc.nextInt();
                //t = new int[n];
                c = new int[n];
         /*String line = br.readLine();
                for (int i = 0; i < n-1; i++) {
                    int spaceindex = line.indexOf(" ");
                    c[i] = Integer.parseInt(line.substring(0,spaceindex))-1;
                    line = line.substring(spaceindex+1);
                }
                c[n-1]=Integer.parseInt(line.trim())-1;*/
                for(int i = 0;i<n;i++){
                    c[i]=sc.nextInt()-1;
                }
                //9 8 10 5 3 2 4 7 6 1
                for (int index = 0; index < n; index++) {
                    while (c[index] != index) {
                        //int where = get(index, index);
                        int where = c[index];
                        int here = c[index];
                        c[index] = c[where];
                        c[where] = here;
                        counter++;
                    }
                    
                }
                System.out.println(counter);
                counter = 0;
            }
        } catch (Exception ex) {
           }
    }
    
    
    public static void main(String[] args) {
        new Monsters().run();
    }
}