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

int main() {
  cin.tie(0);
  cout.tie(0);
  ios_base::sync_with_stdio(0);

  int n;
  cin >> n;

  string s;
  cin >> s;

  int length = n / 10;

  int res = 0;
  int i = 1;
  bool good = true;
  while (i <= n) {
    if (s[i - 1] == 'N') good = false;
    if (i % length == 0) {
      if (good) res++;
      good = true;
    }
    i++;
  }

  cout << res;
}