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#include <iostream>
#include <string>
using namespace std;

int main(void) {
	int n;
	cin >> n;

	string a;
	cin >> a;

	int liczba_testow = n / 10;

	int pkt = 0;
	for (int i = 0; i < n - liczba_testow + 1; i++) {
		bool tmp = true;
		for (int j = i; j < i + liczba_testow; j++) {
			if (a[j] != 'T') {
				tmp = false;
				break;
			}
		}

		if (tmp == true) {
			pkt++;
		}
	}

	cout << pkt << endl;

	return 0;
}