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#include <iostream>

using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	string results;

	cin >> n;
	cin >> results;


	int sizeGroup = n / 10;
	int numberGroups = n / sizeGroup;

	int index = 0;
	bool pass = true;
	int result{};




	for (int i = 0; i < numberGroups; ++i)
	{
		for (int k = 0; k < sizeGroup; ++k)
		{
			if (results[index] == 'N') pass = false;
			++index;
		}
		if (pass)
		{
			++result;
		}
		pass = true;
	}

	cout << result;

}