//{{{
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(...) repN((__VA_ARGS__,rep3,rep2,loop,~))(__VA_ARGS__)
#define loop(n) rep2(_loop_,n)
#define rep2(i,n) rep3(i,0,n)
#define rep3(i,begin,end) for(int i=(int)(begin),i##_end=(int)(end);i<i##_end;++i)
#define repN(a) repX a
#define repX(a0,a1,a2,x,...) x
const int MOD = 1e9+7;
//}}}

int main(void){
	int N;
	cin >> N;
	int it;
	int item[10] = {0};
	rep(i, N) rep(j, 3) cin >> it, item[it - 1]++;
	int ans = 0;
	int count = 0;
	rep(i, 10){
		if(item[i] % 2 == 1) count++;
		ans += item[i] / 2;
	}
	ans += count / 4;
	printf("%d\n", ans);
	return 0;
}