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#include <bits/stdc++.h>
using namespace std;
int n;
string s;

int main()
{
  ios_base::sync_with_stdio(0);

  cin >> n >> s;

  int r = 0;
  bool ok = true;

  for (int i = 0; i < n; i++) {
    if (s[i] == 'N') {
      ok = false;
    }
    if ((i + 1) % (n / 10) == 0) {
      if (ok) {
        r++;
      }
      ok = true;
    }
  }

  cout << r << endl;

  return 0;
}