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#include <cstdio>

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