#include <string>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <list>
#include <stdexcept>
#include <functional>
#include <utility>
#include <iomanip>
#include <ctime>
#include <valarray>
#include <iostream>
#include <sstream>
#include <fstream>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
#define MEM(a,b) memset((a),(b),sizeof(a))
const LL INF = 1e9 + 7;
const int N = 2e5 + 10;

int main()
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	int n;
	cin >> n;
	map<int, int> mc;
	n *= 3;
	while (n--)
	{
		int x;
		scanf("%d", &x);
		mc[x]++;
	}
	int ans = 0;
	int cnt = 0;
	for (auto& [a, b] : mc)
	{
		ans += b / 2;
		cnt += b & 1;
	}
	cout << ans + cnt / 4 << endl;
	return 0;
}