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#include <bits/stdc++.h>
using namespace std;
int n;
int inval; 
char answ[100];
int res;
int pts;
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cin >> n;
	cin >> answ;
	inval = n/10;
	for(int i = 0; i < 10; i++){
		res = 1;
		for(int j = 0; j < inval; j++){
			if(answ[i*inval+j] == 'N'){
				res = 0;
			}
		}
		if(res == 1){
			pts += 1;
		}
	}
	cout << pts;
	return 0;
}