import java.util.*;

public class Stone{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        if(n>2){
        int []arr = new int[n];
        for(int i=0;i<n;i++){
            arr[i] = sc.nextInt();
        }
        System.out.println(arr[n-2]);
        }
        else{
            System.println("Invalid input");
        }
    }
}