#include <bits/stdc++.h>
using namespace std;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define vv(type, c, m, n, i) vector<vector<type>> c(m, vector<type>(n, i))
#define rep(i,a,n) for(int i=(a), i##_len=(n); i<i##_len; ++i)
#define rrep(i,a,n) for(int i=(a), i##_len=(n); i>i##_len; --i)
#define len(x) ((int)(x).size())
#define mp make_pair
#define eb emplace_back
#define em emplace
#define fi first
#define se second
template<typename T> inline T min(T v) {return *min_element(v);}
template<typename T> inline T max(T v) {return *max_element(v);}
template<typename T, typename C> inline T sum(T v, C c) {return accumulate(v, c);}
#define chmax(a,b) if(a<b)a=b
#define chmin(a,b) if(a>b)a=b
template <class T> inline void print(T t){cout << t << "\n";}
template <class H, class... T> inline void print(H h, T... t){cout << h << " ";print(t...);}
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<long long> vll;
typedef vector<string> vs;
typedef vector<bool> vb;
typedef pair<int, int> pii;
const constexpr int INF = 1e9;
int main() {
	int n; cin >> n;
	vi v(11, 0);
	int t;
	rep(i, 0, n) {
		rep(j, 0, 3) {
			cin >> t;
			++v[t];
		}
	}
	int ans = 0, cnt = 0;
	rep(i, 1, 11) {
		ans += v[i] / 2;
		cnt += v[i] % 2;
	}
	print(ans + cnt / 4);
	return 0;
}