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#include <iostream>



using namespace std;
int main()
{
	int n;
	cin >> n;
	string s;
	cin >> s;
	int pkt = 0;
	for (int i = 0; i < n ; i+=n/10)
	{
		
		bool tr = true;
		

		for (int j = i; j < i+n/10; j++)
		{
			
			if (s[j] == 'N')
				tr = false;
		}
		if (tr)
			pkt++;

	}

	cout << pkt << endl;
}