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#include <iostream>
#include <bitset>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;

void solve() {
	int n, ans=0;
	string a;
	bool ok;
	cin >> n >> a;

	for (int i = 0; i < 10; i++) {
		ok = 1;
		for (int j = 0; j < n/10; j++) {
			if (a[i*(n/10)+j] == 'N') {
				ok = 0;
				break;
			}
		}
		if (ok == 1)
			ans++;
	}

	cout << ans;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	
	solve();
	cout << '\n';

	return 0;
}