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#include <iostream>
#include <string>

int main() {
	int n; std::cin >> n;
	std::string s; std::cin >> s;
	int group_size = n / 10, res = 0;

	for(int i = 0; i < n; i += group_size) {
		int passing_in_group = 0;
		for(int j = i, end = i + group_size; j < end; ++j)
			passing_in_group += s[j] == 'T';
		if(passing_in_group == group_size) ++res;
	}

	std::cout << res << '\n';
}