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#include <iostream>
#include <string>
using namespace std;

bool IsValid(string s){
	for(int i = 0; i < s.length(); i++)
		if(s[i] == 'N')
			return false;
	return true;
}

int main(int argc, char *argv[])
{
	int n, count = 0;
	string s;
	cin>>n>>s;
	int groupLen = n/10;
	int index = 0;
	while(index < s.length()){
		if(IsValid(s.substr(index,groupLen)))
			count++;
		index += groupLen;
	}
	cout<<count;
}