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//GRT_2018
#include <bits/stdc++.h>
#define PB push_back
#define ST first
#define ND second
//mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

using namespace std;

using ll = long long;
using pi = pair<int,int>;
using vi = vector<int>;

int n;
string s;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int ans = 0;
	cin >> n >> s;
	for (int i = 0; i < n; i += n/10) {
		bool good = true;
		for (int j = i; j < i + n/10; ++j) {
			if (s[j] == 'N') {
				good = false;
			}
		}
		ans += good;
	}
	cout << ans;
}