import java.util.*;
import java.lang.*;
import java.io.*;

public class Main {
	public static void main (String[] args) throws java.lang.Exception {

		Scanner sc = new Scanner(System.in);
      int n = sc.nextInt();
      int arr[] = new int[n];
      for(int i=0;i<n;i++)arr[i]=sc.nextInt();
      int m=-1, ind=0;
      for(int i=0;i<n;i++)
      {
        if(m<arr[i])
        {
          m=arr[i];
          ind=i;
        }
      }
      m=-1;
      for(int i=0;i<n;i++){
        if(ind!=i && m<arr[i])
        {
          m=arr[i];
        }

      }
	System.out.print(m);

	}
}