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#include <iostream>

using namespace std;

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

	int n;

	cin >> n;

	int number_of_tests_in_group = n / 10;
	char passed;
	bool passed_gorup = true;
	int points = 0;

	for (int i = 0; i < 10; i++)
	{
		passed_gorup = true;

		for (int j = 0; j < number_of_tests_in_group; j++)
		{
			cin >> passed;
			if (passed == 'N')
			{
				passed_gorup = false;
			}
		}

		if (passed_gorup) {
			points++;
		}
	}

	cout << points;
}