#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
#define LONG_INF 100000000000000
int cnt[10000] = {};
int main() {
	int n;
	cin >> n;
	REP(i, n) {
		int a, b, c;
		cin >> a >> b >> c;
		cnt[a]++;
		cnt[b]++;
		cnt[c]++;
	}
	int ans = 0;
	int pop = 0;
	for (int i = 0;i <= 10;++i) {
		ans += cnt[i] / 2;
		pop += cnt[i] % 2;
	}
	ans += pop / 4;
	cout << ans << endl;
	return 0;
}