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#include <vector>
#include <iostream>


int main() {
	int n;
	std::cin >> n;
	int score = 0;
	for (int i = 0; i < 10; i++) {
		bool allTrue = true;
		for (int j = 0; j < n/10; j++)
		{
			char c;
			std::cin >> c;
			if(c == 'N'){
				allTrue = false;
			}
		}
		if (allTrue)
			score++;
	}
	std::cout << score;
}