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package com.HackerRank;
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;
public class SockMerchant {
/*
* Hacker Rank Algorithm Question - Sock Merchant
* *
* Category : Warm-up Challenges
* Solved Date : 2019-12-29
* Author : TK Lee
*
* Source : https://www.hackerrank.com/challenges/sock-merchant/problem?h_l=interview&playlist_slugs%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D=warmup
*/
// Complete the sockMerchant function below.
static int sockMerchant(int n, int[] ar) {
int paircnt =0;
Map<Integer,Integer> pile = new HashMap<Integer, Integer>();
for(int idx =0; idx<n; idx++)
{
if (pile.containsKey(ar[idx])){
pile.replace(ar[idx], (pile.get(ar[idx])+1));
} else {
pile.put(ar[idx],1);
}
}
for (Map.Entry<Integer, Integer> entry : pile.entrySet()) {
Integer key = entry.getKey();
Integer value = entry.getValue();
if (value > 1) {
paircnt += (value / 2);
}
}
return paircnt;
}
private static final Scanner scanner = new Scanner(System.in);
public static void main(String[] args) throws IOException {
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
int n = scanner.nextInt();
scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
int[] ar = new int[n];
String[] arItems = scanner.nextLine().split(" ");
scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
for (int i = 0; i < n; i++) {
int arItem = Integer.parseInt(arItems[i]);
ar[i] = arItem;
}
int result = sockMerchant(n, ar);
bufferedWriter.write(String.valueOf(result));
bufferedWriter.newLine();
bufferedWriter.close();
scanner.close();
}
}