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#include <iostream>


using namespace std;








int main() 
{
	int n;
	string ciag;
	
	cin>>n;
	cin>>ciag;
	
	int count = 0;
	
	for(int i = 0; i < n ; i+=n/10)
	{
		string grupa = ciag.substr(i , n/10);
		count += (int)(grupa.find('N') == string::npos);
	}
	
	cout<<count;
}