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

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int i;
	int n;
	cin>>n;
	string s;
	cin>>s;
	int wy = 0;
	for (i = 0; i < n; i += n/10){
		bool good = 1;
		for (int j = i; j < i+n/10; j++){
			if (s[j] == 'N') good = 0;
		}
		wy += good;
	}
	cout<<wy<<"\n";
	return 0;
}