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#include <iostream>
#include <string>

int main()
{
	int n;
	std::string input;
	std::cin >> n >> input;

	bool passed = true;
	int points = 0;
	for (int j = 0; j < n; j += 2)
	{
		passed = true;
		for (int i = 0; i < n / 10; i++)
		{
			if (input[j + i] == 'N')
			{
				passed = false;
				break;
			}
		}

		if (passed)
		{
			points++;
		}
	}

	std::cout << points;
}