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

int main(){
	int n, score = 0;
	string a;
	cin >> n >> a;
	for(int i = 0; i < 10; i++){
		bool allOk = 1;
		for(int j = 0; j < (n / 10); j++){
			if(a[i * (n / 10) + j] == 'N'){
				allOk = 0;
			}
		}
		score += (int)allOk;
	}
	cout << score << endl;
}