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#include <bits/stdc++.h>

using namespace std;

int n;
string s;

int main() {
  cin >> n;
  cin >> s;

  int res = 0;
  int groupSize = n / 10;
  for (int i = 0; i < n / groupSize; ++i) {
    bool czy = true;
    for (int j = i * groupSize; j < (i + 1) * groupSize; ++j) {
      if (s[j] == 'N') {
        czy = false;
        break;
      }
    }
    res += czy;
  }
  cout << res << endl;
}