#include <bits/stdc++.h>
using namespace std;
string s[10005];
int main()
{
	int n;
	cin >> n;
	for (int i = 1;i <= n + 1;i++) getline (cin,s[i]);
	for (int i = 1;i <= n - 3;i++) s[i] += s[i + 1] + s[i + 2] + s[i + 3];
	int zs = 0;
	for (int i = 2;i <= n - 3;i++)
	{
		bool ok = 0;
		for(int j = 1;j < i;j++) if (s[i] == s[j]) ok = 1;
		if (ok == 0) zs++;
	} 
	cout << zs;
	return 0;
}