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

int main(){
	int n; cin >> n; int ile = n/10;
	bool dobrze = 1;
	string s; cin >> s; int sum = 0;
	for(int i = 0; i < n; i++){
		if(s[i] == 'N') dobrze = 0;
		if((i+1) % ile == 0){
			if(dobrze)sum++;
			dobrze = 1;
		}

	}
	cout << sum << '\n';
	return 0;
}