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#include <bits/stdc++.h>


using namespace std;



int main(){
	int n;
	cin >> n;
	string s;
	cin >> s;
	int ans = 0;
	for (int i = 0; i < 10; i++){
		bool ok = 1;
		for (int j = (n/10)*i; j < (n/10)*(i+1); j++){
			if (s[j] == 'N') ok = 0;
		}
		ans += ok;
	}
	cout << ans;
	return 0;
}