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#include <iostream>

int main() {
	int n;
	std::cin >> n;
	
	std::string res;
	std::cin >> res;
	
	int points = 0;
	for (int i = 0; i < n; i += n/10) {
		bool all = true;
		for (int j = i; j < i + n/10; ++j) {
			if (res[j] == 'N') all = false;
		}
		points += all;
	}
	
	std::cout << points << '\n';
	
	return 0;
}