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#include <iostream>
#include <vector>

using namespace std;

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

	int n;
	cin >> n;

	string T;
	cin >> T;

	int k = n / 10;
	vector<bool> R(n / k, true);
	for (int i = 0; i < n; i++)
		if (T[i] == 'N')
			R[i / k] = false;

	int res = 0;
	for (auto&& r : R)
		res += r;

	cout << res;
}