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#include<cstdio>
using namespace std;

int main() {
	int n;
	scanf("%d", &n);
	int gsize = n / 10;
	int groups = 10;

	char buff_arr[1000];
	char* buff = (char *)buff_arr;
	scanf("%s", buff);

	int result = 0;

	for (int g = 0; g < 10; g++) {
		int isok = 1;
		for (int i = 0; i < gsize; i++) {
			if (*buff == 'N') {
				isok = 0;
			}
			++buff;

		}
		
		result += isok;
	}

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


	return 0;
}