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#include <iostream>

using namespace std;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	int n;
	cin >> n;

	int x = 0;
	bool is_ok = true;
	for (int i = 1; i <= n; i++) {
		char c;
		cin >> c;
		if (c == 'N')
			is_ok = false;
		if (i % (n / 10) == 0) {
			x += is_ok;
			is_ok = true;
		}
	}

	cout << x << "\n";
}