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// C1 - Liczenie punktow
#include <iostream>
using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	int n;
	char c;
	bool isOk;
	int pts;
	
	pts = 0	;
	cin >> n;
	for (int i = 0; i < n; ++i) {
		if (i % (n / 10) == 0) {
			isOk = true;
		}
		cin >> c;
		
		if (c == 'N') {
			isOk = false;
		}
		
		if ((i % (n / 10) == n / 10 - 1) && isOk) {
			++pts;
		}
	}
	
	cout << pts << endl;	
	
	return 0;
}