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#include <iostream>

using namespace std;

int main() {

  int n;

  cin >> n;

  string slowo;

  cin >> slowo;

  int segment = n / 10;

  int wynik = 0;

  for (int i = 0; i < n; i += segment) {
    wynik++;
    for (int j = i; j < i + segment; j++) {
      if (slowo[j] == 'N') {
        wynik--;
        break;
      }
    }
  }

  cout << wynik << "\n";

  return 0;
}