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#include <iostream>

using namespace std;

int main() {
  ios_base::sync_with_stdio(0);
  int n;
  cin >> n;
  string s;
  cin >> s;

  int points = 0;
  int i = 0;
  for (int test_suite = 0; test_suite < 10; test_suite++) {
    bool all = true;
    for (int j = 0; j < n / 10; j++) {
      if (s[i] == 'N') {
        all = false;
      }
      i++;
    } 
    if (all) {
      points++;
    }
  }
  cout << points << endl;
  return 0;
}