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#include <iostream>

int main()
{
	std::ios_base::sync_with_stdio(0);
	std::cin.tie(0);
	int n;
	std::string str;
	std::cin >> n;
	std::cin >> str;
	n /= 10;
	int out = 0;
	for (int i = 0; i < 10; ++i)
	{
		bool err = 0;
		for (int j = 0; j < n; ++j)
		{
			err |= (str[i * n + j] == 'N');
		}
		out += !err;
	}
	std::cout << out;
}