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#include <iostream>
#include <vector>

int main() {
	long iloscTestow{};
	std::string line;
	std::cin >> iloscTestow;
	std::cin >> line;
	long grupa = iloscTestow / 10;
	long result{};
	long groupResult{};
	long groupCount{};
	for (int i = 0; i < iloscTestow; i++) {
		if (line[i] == 'T') {
			groupResult++;
		}
		groupCount++;
		if (groupCount == grupa) {
			if (groupResult == grupa) {
				result++;
			}
			groupCount = 0;
			groupResult = 0;
		}
	}
	std::cout << result << std::endl;
	return 0;
}