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#include <iostream>

using namespace std;

int main() { 
	int n;
	int couter = 0;
	string str;

	cin >> n;
	cin >> str;

	int dlugoscPaczki = n / 10;

	for (int i=0; i < n; i += dlugoscPaczki) {
		string tempS = str.substr(i, dlugoscPaczki);
		//cout << tempS << endl;
		if(tempS.find('N') == std::string::npos) couter++;
	}

	cout << couter;
}