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#include<iostream>

using namespace std;

int main () {
	int n;
	cin >> n;
	int w = 0;
	string s;
	cin >> s;
	int batch = n / 10;
	for(int i = 0; i < n; i+=batch) {
		for(int j = 0; j < batch; j++) {
			if (s[i + j] == 'N') break;
			else if (j == batch - 1) {
				w++;
			}
		}
	}
	cout << w;
}