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#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main() {
	int n;
	cin >> n;
	string s;
	cin >> s;
	int segment = n / 10;
	int res = 0;
	for (int i = 0; i < n; i += segment) {
		bool correct = true;
		for (int j = 0; j < segment; ++j) {
			if (s[i + j] == 'N') {
				correct = false;
				break;
			}
		}

		if (correct) {
			++res;
		}
	}

	cout << res << endl;
	return 0;
}