// editor1
import java.util.*;
public class SecoundNumber{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        if(n<2 || n>=10){
            System.out.println("Invalid input");
            return;
        }else{
            if(!arr){
                System.out.println("Invalid input");
                return;
            }
            int arr[] = new int[n];
            for(int i=0; i<n; i++){
                arr[i] = scan.nextInt();
            }
            Arrays.sort(arr);
            System.out.println(arr[n-2]);
        }
    }
}