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#include <bits/stdc++.h>
using namespace std;
typedef long long lld;

int n;
char s[1024];

int main() {
	scanf("%d%s", &n, s);
	n = n / 10;
	int sum = 0, res;
	for (int i = 0; i < 10; ++i) {
		res = 1;
		for (int j = i * n; j < (i + 1) * n; ++j) {
			if (s[j] == 'N') {
				res = 0;
				break;
			}
		}
		sum += res;
	}
	printf("%d\n", sum);
	return 0;
}