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#include <iostream>
#include <string>

using namespace std;

int main() {

	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n, result = 0;
	cin >> n;

	string str;
	cin >> str;

	for (int i = 0; i < 10; i++) {
		bool correct = true;
		for (int j = 0; j < n/10; j++) {
			if (str[(n/10)*i+j] == 'N')
				correct = false;
		}
		if (correct) result++;
	}

	cout << result << "\n";

	return 0;
}