import java.util.*;
public class Main{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int second = Integer.MIN_VALUE;
        int arr[]=new int[n];

        if(n>=2 && n<=10)
        {
            for(int i=0;i<=n-1;i++)
            {
                arr[i]=sc.nextInt();
            }
            Arrays.sort(arr);
            int large=arr[n-1];
            for(int i=n-2;i>=0;i--)
            {
                if(arr[i]<large)
                {
                    second=arr[i];
                    break;
                }
            }
            System.out.println(second);
            return;
        }
        else
        {
            System.out.println("Invalid input");
            return;
        }
        if(second==Integer.MIN_VALUE)
        {
            System.out.println("Invalid input");
        }
    }
}