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 */
package monsters;

import java.util.Scanner;

/**
 *
 * @author cteam057
 */
public class Monsters {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        
        Scanner sc = new Scanner(System.in);
        
        int chambers = sc.nextInt();
        int[] monsters = new int[chambers];
        int episodes = 0;
        int smallest = 1;
        
        
        for (int i = 0; i < chambers; i++) {
            
            monsters[i] = sc.nextInt();
                        
        }
        
        for (int i = 0; i < chambers; i++) {
            
              
                int k = i;
                
                while (monsters[k] != smallest) {

                    k++;
                    
                }

                if (monsters[k] != monsters[i]) {
                    
                    int buffer = monsters[i];
                    monsters[i] = monsters[k];
                    monsters[k] = buffer;

                    episodes++;
                    //smallest++;
                    
                }
            smallest++;
                    
                }  
                
            
                                        
        
 
        System.out.print(episodes);
        
    }
    
}