#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second

const int INF = 1e6 + 7;
string s;
int n, res;
bool czy = true;

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