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#include <iostream>
#include <string>

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

	int n;
	std::string tests;

	std::cin >> n >> tests;

	const int groupSize = n / 10;

	int points = 0;

	for (int j = 0; j < n; j += groupSize)
	{
		points++;
		for (int i = j; i < (j + groupSize); i++)
		{
			if (tests[i] == 'N')
			{
				points--;
				break;
			}
		}
	}

	std::cout << points;

	return 0;
}