/* package whatever; // don't place package name! */ import java.util.*; import java.lang.*; import java.io.*; /* Name of the class has to be "Main" only if the class is public. */ class Ideone { public static void main (String[] args) throws java.lang.Exception { // your code goes here BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int n = Integer.parseInt(br.readLine()); String[] lines = br.readLine().split(" "); HashMap map = new HashMap(); int idx = 0; for(String st:lines){ map.put(Integer.parseInt(st),idx++); } int tmp = n; int ans; for(ans = n;ans>0;ans--){ if(map.get(ans) > tmp){ break; } tmp = map.get(n); } System.out.println(ans); } }