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#include <iostream>
#include <sstream>

void prog_main(std::istream& in, std::ostream& out)
{
	int num = 0;
	in >> num;
	int round = num / 10;
	char c;
	int j = 0;
	bool good = true;
	int good_cnt = 0;
	for (int i = 0; i < num; i++)
	{
		in >> c;
		if (c == 'N') {
			good = false;
		}
		
		if (j == round - 1) {
			if (good) {
				good_cnt++;
			}
		}

		if (j == round - 1) {
			j = 0;
			good = true;
		}
		else {
			j++;
		}
	}
	out << good_cnt << "\n";
}

#ifndef TEST
int main(int argc, char* argv[])
{
	prog_main(std::cin, std::cout);
	return 0;
}
#endif