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#include <bits/stdc++.h>
using namespace std;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  int n;
  cin >> n;
  vector<char> v(n);
  for (int i = 0; i < n; i++) {
    cin >> v[i];
  }

  int score = 0;
  for (int i = 0; i < 10; i++) {
    bool ok = true;
    for (int j = 0; j < n / 10; j++) {
      if (v[i * n / 10 + j] == 'N') {
        ok = false;
        break;
      }
    }
    if (ok)
      score++;
  }
  cout << score << "\n";
}