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#include <stdio.h>

char buf[101];

int main(void)
{
	int n;

	scanf("%d", &n);
	scanf("%s", buf);

	int b = n / 10;
	int score = 0;

	for (int i = 0; i < n; i += b) {
		bool good = true;
		for (int j = 0; j < b; j++) {
			if (buf[i+j] == 'N')
				good = false;
		}
		if (good)
			score++;
	}

	printf("%d\n", score);

	return 0;
}