using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class P{
    public static void Main(){
        int n = InputToInt();
        int[] m = Input().Split().MapInt();
        for(int i=n; i>0; --i){if(m[i-1]==n){--n;}}
        Print(n);
    }
    
    public static void Print(params object[] o){
        for(int i=0; i<o.Length; ++i){
            Console.Write(o[i]);
            Console.Write(i==o.Length-1 ? '\n' : ' ');
        }
    }
    public static string Input(){return Console.ReadLine();}
    public static int InputToInt(){return int.Parse(Console.ReadLine());}
}

public static class StringArrayExtensions{
    public static int[] MapInt(this string[] s){return s.Select(int.Parse).ToArray();}
    public static long[] MapLong(this string[] s){return s.Select(long.Parse).ToArray();}
    public static float[] MapFloat(this string[] s){return s.Select(float.Parse).ToArray();}
    public static double[] MapDouble(this string[] s){return s.Select(double.Parse).ToArray();}
}