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#include <bits/stdc++.h>
using namespace std;
string s;
bool if_good = true;
int n,group_size,value;
int main()
{
	cin>>n;
	cin>>s;
	group_size = n / 10;
	for(int i = 0;i < s.size();++i)
	{
		if(s[i] == 'N')if_good = false;	
		if(!((i + 1) % group_size))
		{
			if(if_good)++value;
			if_good = true;
		}
	}
	cout<<value<<endl;
}