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#include <iostream>

using namespace std;

int main() {
	int n, points = 0;
	string tests;
	cin >> n;
	cin >> tests;

	for (int i = 0; i < tests.length(); i++) {
		bool isValid = true;

		for (int j = 0; j < n / 10; j++) {
			if(tests[i+j] != 'T') {
				isValid = false;
				break;
			}
		}

		if (isValid) {
			points++;
		}
	}

	cout << points;

}