using System;

​

public class Program

{

    public static void Main()

    {

        int[] arr = new int[100];

        int[] arr2 = new int[100];

        int[] arr3 = new int[100];

        int n;

        int z = 1;

        int ctr = 0;

        Console.WriteLine("Input the number of elements to store in array:");

        n = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Input {0} number of elements in the array: " , n);

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

        {

            Console.Write("element - {0} :", x);

            arr[x] = Convert.ToInt32(Console.ReadLine());

        }

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

        {

            arr2[x] = arr[x];

            arr3[x] = 0;

        }

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

        {

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

            {

                if (arr[x] == arr2[y])

                {

                    arr3[y] = z;

                    z++;

                }

            }

            z = 1;

        }

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

        {

            if (arr3[x] == 2)

            {

                ctr++;

            }

        }

        Console.Write("\nThe total number of duplicates in the array are {0}", ctr);

    }

}