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

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

	int n;
	cin >> n;
	string s;
	cin >> s;
	int wyn = 0;
	for (int i = 0; i < 10; i++) {
		bool ok = true;
		for (int x = 0; x < n/10; x++) {
			int j = x+n/10*i;
			if (s[j] == 'N')
				ok = false;
		}
		if (ok)
			wyn++;
	}
	
	cout << wyn;

	return 0;
}