import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int k=0;
        int num[]=new int [5];
        int[] types = new int[n];
        for(int i=0;i < n;i++)
        {
            types[i] = in.nextInt();          
        }
        for(int j=0;j<n;j++)
            {
             for(int l=j+1;l<n;l++)
                 {
                 if(types[j]==types[l])
                     {
                     k++;
                    num[k]=types[j];
                     }
                 }
            }
        if(k>0)
            {
            System.out.println(num[k]);
            }
        // your code goes here
    }
}