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#include <iostream>
using namespace std;
int main() {
  int n, res = 0;
  cin >> n;
  string s;
  cin >> s;
  int k = n / 10;
  for (int i = 0; i < n; i += k) {
    bool wa = false;
    for (int j = i; !wa && j < i + k; j++)
      wa = (s[j] == 'N');
    res += !wa;
  }
  cout << res << '\n';
}