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#include <iostream>
using namespace std;

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	int n, ans=0; cin >> n;
	string s; cin >> s;
	for (int i=0; i<n; i+=n/10){
		bool t = true;
		for (int j=i; j<i+n/10; j++) if (s[j] == 'N') t = false;
		if (t) ans++;
	}
	cout << ans << '\n';
}