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#include <iostream>
using namespace std;

int n, ans, na;
string s;
int main(){
	ios_base::sync_with_stdio(0);
	cin>>n>>s;
	for (int i=0; i<n; i+=(n/10)){
		na = 1;
		for (int j=i; j<i+(n/10); j++){
			if (s[j] == 'N') na = 0; 
		}
		ans+=na;
	}
	cout<<ans<<"\n";
}