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#include <iostream>

using namespace std;

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  int n;
  cin >> n;
  int a = n / 10;
  int wyn = 0;

  for (int i = 0; i < n; i += a) {
    bool test = true;
    for (int j = 0; j < a; j++) {
      char t;
      cin >> t;
      if (t == 'N')
        test = false;
    }
    if (test)
      wyn++;
  }

  cout << wyn << "\n";

  return 0;
}