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#include <iostream>
#include <string>

using namespace std;

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

  string results;
  cin >> results;

  int points = 0;

  for (int i = 0; i < n; i += n/10)
  {
    bool all_correct = true;

    for (int j = 0; j < n/10; j++)
    {
      if (results[i + j] == 'N') all_correct = false;
    }

    if (all_correct) points++;
  }

  cout << points << endl;

  return 0;
}