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 s=6,sn=0,types_i,types_j;
        int[] types = new int[n];
        for(types_i=0; types_i < n; types_i++){
            types[types_i] = in.nextInt();
        }
        for(types_i=0;types_i<n-1;types_i++)
            {
            for(types_j=1;types_j<n;types_j++)
                {
                if(types[types_i]==types[types_j])
                    {
                    sn=types[types_i];
                    if(sn<s)
                        s=sn;
                }
            }
        }
        // your code goes here
        System.out.println(s);
    }
}