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