Eleminate Duplicate At Runtime In Arrays

static int Read(int[]arr)
        {
             int First = arr[0];
        int Second = arr[0];
        int third = arr[0];
            for (int i = 0; i < arr.Length; i++)
            {

                Console.Write("The Enterd "+i.ToString() +":");
                arr[i] = int.Parse(Console.ReadLine());

                if (arr[i] > First)
                {
                    First = arr[i];
                }
            }

            for (int j = 0; j < arr.Length; j++)
            {
                if (arr[j] > Second && First > arr[j])
                {
                    Second = arr[j];
                }
            }

            for (int k = 0; k < arr.Length; k++)
            {
                if (arr[k] > third && Second > arr[k])
                {
                    third = arr[k];
                }
            }

            return third;


        }

static void Main(string[] args)
        {
            int[] v = new int[5];
            Console.WriteLine(Read(v));
        }
    }
}