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#include <iostream>
using namespace std;

int main() {
  int n;
  cin >> n;
  n /= 10;
  int s = 0;
  char c;
  for(int i = 0; i < 10; i++) {
    bool ok = true;
    for(int j = 0; j < n; j++) {
        cin >> c;
        if(c == 'N')
          ok = false;
    }
    if(ok)
      s++;
  }
  cout << s << endl;
  return 0;
}