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

int n;
string s;
bool flag = false;
int result = 10;

int main() {
	cin >> n >> s;
	for (int j = 0; j < n; j+=n/10) {
		for (int i = 0; i < n / 10; i++) {
			if (s[i + j] == 'N') {
				flag = true;
			}
		}
		if (flag) {
			result--;
		}
		flag = false;
	}
	cout << result;
	return 0;
}