using System;

​

namespace HelloWorld

{

    class Program

    {

​

​

        public static void Main(string[] args)

        {

            int temp;

            int[] arr = { 4, 6, 8, 10, 9, 5, 3, 2, 1, 0 };

            int n = arr.Length;

            for(int i = 0; i < n-1; i++)

            {

                for (int j = 0; j < n - i - 1; j++)

                {

                    if (arr[i] > arr[j])

                    {

                        temp = arr[i];

                        arr[i] = arr[j];

                        arr[j] = temp;

                    }

​

                 }

​

             }

​

            Console.WriteLine(arr[n-2]);

​

​

        }

    }

}