using System;

public class Program

{

    public static void Main()

    {

        int n;

        Console.WriteLine("Enter the value of n");

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

        int [] a = new int [n];

        Console.WriteLine("Enter elements into the array");

        int i;

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

        {

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

        }

        int j,k,t=0;

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

        {

            for(k=j+1;k<=n-1;k++)

            {

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

                {

                    t++;

                }

            }

        }

        Console.WriteLine("Number of non-unique elements in the given array are {0}",t);

    }

}