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#include <iostream>

using namespace std;

int main(){
	int n;
	cin >> n;
	int ans = 0;
	bool corr;
	char c;
	for(int i = 0; i < 10; i++){
		corr = true;
		for(int j = 0; j < n / 10; j++){
			cin >> c;
			if(c == 'N')
				corr = false;
		}
		if(corr)
			ans++;
	}

	cout << ans;
}