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#include <bits/stdc++.h>
using namespace std;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n;
	cin >> n;
	vector <bool> v(10, 1);
	string s;
	cin >> s;
	for (int i = 0; i < n; i++) {
		if (s[i] == 'N')
			v[i/(n/10)] = 0;
	}
	int res = 0;
	for (auto i : v)
		if (i) res++;
	cout << res << "\n";
}