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#include <iostream>
using namespace std;

int main() {
	int n;
	std::cin >> n;
	int cnt = 0;
	int res = 0;
	char c;
	for (int g = 0 ; g < 10 ; g++) {
		for (int j = 0 ; j < n / 10 ; j++) {
			std::cin >> c;
			if (c == 'T') cnt++;
		}
		if (cnt == n / 10) res++;
		cnt = 0;
	}
	std::cout << res;
}