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#include <iostream>

using namespace std;

int main() {
	
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int n;
	string s;
	cin>>n>>s;
	
	int size = n / 10;
	
	int points = 0;
	bool pass;
	
	for (int i = 0; i < n; i += size) {
		pass = true;
		for (int j = i; j < i + size; j++) {
			if (s[j] == 'N') {
				pass = false;
				break;
			}	
		}
		if (pass) points++;
	}
	
	cout<<points;
	return 0;
}