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#include <iostream>
#include <string>

using namespace std;

int main()
{
	int n;
	string str;
	cin >> n >> str;

	int m = n / 10;
	int res = 0;

	for (int i = 0; i < n; )
	{
		bool ok = true;

		for (int j = 0; j < m; ++j, ++i)
		{
			ok = ok && str[i] == 'T';
		}

		if (ok)
			++res;
	}

	cout << res << endl;

	return 0;
}