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#include <cstdio>

int main(void) {
	size_t n;
	char s[100];
	scanf("%zu\n%s", &n, s);
	size_t result = 0;
	for (size_t i = 0; i < 10; ++i) {
		bool good = true;
		for (size_t j = 0; j < n/10; ++j) {
			if (s[n*i/10+j] == 'N') {
				good = false;
				break;
			}
		}
		if (good)
			++result;
	}
	printf("%zu\n", result);
}