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#include <bits/stdc++.h>

using namespace std;

int main(){
  int n;
  string s;
  cin>>n;
  cin>>s;
  int step = n/10;
  int i = 0;
  int wyn = 0;
  while (i < s.size()) {
	  bool ok = true;
	  for(int p = i; p < i + step; p++){
		  if(s[p] == 'N') ok = false;
	  }
	  i += step;
	  if (ok) wyn++;
  }
  cout << wyn;
}