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#include <bits/stdc++.h>

using namespace std;

int main () {
	int n;
	cin>>n;
	string str;
	cin>>str;
	int t = n/10;
	int points=0;
	for(int i=0;i<10;i++) {
		bool p=true;
		for (int j=0;j<t;j++) {
			if(str[t*i+j]=='N') {
				p=false;
			}
		}
		if(p) {
			points++;
		}
	}
	cout<<points;
}