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

#define int int64_t
#define pb push_back
#define st first
#define nd second
#define pii pair<int, int>
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()

int32_t main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n;
	string a;
	cin >> n >> a;
	int ans = 0;
	for(int i=0;i<10;i++) {
		bool yes = true;
		for(int j=0;j<n/10;j++) {
			if(a[i*n/10+j]=='N') yes = false;
		}
		if(yes) ans++;
	}
	cout << ans << "\n";
}