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#include <bits/stdc++.h>

#define ll long long
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define boost ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define watch(x) cout << (#x) << " : " << x << '\n'

using namespace std;

void solve() {
	int n;
	cin >> n;
	string s;
	cin >> s;
	assert(n % 10 == 0);
	int block = n / 10;
	int ans = 0;
	for (int i = 0; i < n; i += block) {
		bool ok = true;
		for (int j = i; j < i + block; j++)
			if (s[j] == 'N')
				ok = false;
		ans += ok;
	}
	cout << ans << '\n';
}

int main() {
	boost;
	solve();
	return 0;
}