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#if defined(EMBE_DEBUG) && !defined(NDEBUG)
#include "embe-debug.hpp"
#else
#define LOG_INDENT(...) do {} while (false)
#define LOG(...) do {} while (false)
#define DUMP(...) do {} while (false)
#endif

#include <cassert>
#include <iostream>
using namespace std;

namespace {
}

int main()
{
  iostream::sync_with_stdio(false);
  cin.tie(nullptr);

  int n;
  cin >> n;

  int res = 0;
  for (int i = 0; i < 10; ++i) {
    bool ok = true;
    for (int j = 0; j < n / 10; ++j) {
      char c;
      cin >> c;
      assert(c == 'T' || c == 'N');
      if (c == 'N') ok = false;
    }
    if (ok) res += 1;
  }

  cout << res << endl;

  return 0;
}