using System;

public class Program

{

    public static void Main()

    {

        int n,i,j;

        int[] a=new int[20];

        int count=0;

        Console.Write("enter size");

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

        Console.Write("enter the element");

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

        {

            a[i]=Convert.ToInt32(Console.ReadLine());

        }

        Console.Write("duplicate elements");

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

        {

        for(j=i+1;j<n;j++)

        {

            if(a[i]==a[j])

            {

                Console.WriteLine(a[j]);

                count++;

                break;

            }

        }

        }

        Console.WriteLine("count duplicate element " +count);

  }

}