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) {
        
        int i=0;
        int j=0;
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] types = new int[n];
        	        ArrayList<Integer> list1 = new ArrayList<Integer>();  

        for(int types_i=0; types_i < n; types_i++){
            types[types_i] = in.nextInt();
        }
        // your code goes herefor ( i = 0; i < n; i++) 
	        for ( i = 0; i < n; i++) 
	        {
	            for ( j = i + 1; j < n; j++) 
	            {
	                if (types[i] == types[j]) 
	                {
	                    list1.add(types[i]);
	                }
	            }
            }
		     System.out.println(list1.get(0));

	       

    }
}