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#include<bits/stdc++.h>

#define st first
#define nd second
#define pb(x) push_back(x)
#define pp(x) pop_back(x)
#define mp(a, b) make_pair(a, b)
#define all(x) (x).begin(), (x).end()
#define rev(x) reverse(all(x))
#define sor(x) sort(all(x))
#define sz(x) (int)(x).size()
#define rsz(x) resize(x)

using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii > vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef string str;
#define BOOST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL); 
int n; string s; 
int main(){ 
	cin >> n >> s;  
	int wynik = 0; 
	int pack = n / 10; 
	bool good; 
	for(int i = 0; i < 10; i++){ 
		good = 1; 
		for(int j = 0; j < pack; j++){ 
			if(s[pack * i + j] == 'N') 
				good = 0; 
		}  
		wynik += good; 
	} 
	cout << wynik ;
}