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#include <bits/stdc++.h>
using namespace std;

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n;
	cin >> n;
	string s;
	cin >> s;
	int a = n/10;
	bool b = 1;
	int wynik = 0;
	for(int i = 0; i < n; i++){
		if(s[i] == 'N') b = 0;
		if(i%a == a-1 && b) wynik++;
		if(i%a == a-1) b = 1;
	}
	cout << wynik;
	return 0;
}