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#include <cstdio>

int main() {
	int n;
	scanf("%d\n", &n);
	int suiteSize = n / 10, points = 0;
	for (int i=0; i<10; i++) {
		bool isOk = true;
		for (int j=0; j<suiteSize; j++) {
			char c;
			scanf("%c", &c);
			if (c == 'N') isOk = false;
		}
		points += isOk;
	}
	printf("%d", points);
}