using System;

​

public class Program

{

    public static void Main()

    {

        int n = int.Parse(Console.ReadLine());

        int[] array = new int[n];

        int[] array2 = new int[n];

        Random r = new Random();

        int temp = 0;

        int temp2 = 0;

        for (int i = 0; i < n; i++)

        {

            array[i] = r.Next(-20, 20);

            Console.WriteLine(array[i]);

        }

​

        for (int i = 0; i < n; i++)

        {

            if (array[i] < 0)

            {

                array2[i] = array[i];

            }

        }

    Array.Reverse(array2);

    for (int i = 0; i < n; i++)

    {

        if (array2[i] < 0)

        {

            temp2++;

            if (temp2 == 2)

            {

                temp = array2[i];

            }

        }

    }

​

        Console.WriteLine("Pre-last element : {0}", temp);

        Console.WriteLine("Mass");

        for (int i = 0; i < n; i++)

        {

            if (array[i] < 0)

            {

                array[i] += temp;

                Console.WriteLine(array[i]);

            }

            else

            {

                Console.WriteLine(array[i]);

            }

        }

    }

}