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#include <bits/stdc++.h>
using namespace std;
using LL = long long;
#define FOR(i, l, r) for (auto i = (l); i <= (r); ++i)
#define REP(i, n) FOR (i, 0, n - 1)
template<class A, class B>
auto&
operator<<(ostream& o, pair<A, B> p)
{
  return o << "(" << p.first << ", " << p.second << ")";
}
template<class T>
auto
operator<<(ostream& o, T x) -> decltype(x.end(), o)
{
  o << "{";
  int i = 0;
  for (auto e : x) o << (", ") + 2 * !i++ << e;
  return o << "}";
}
#ifdef DEBUG
#define debug(x...)                                                            \
  cerr << "[" #x "]: ", [](auto... $) { ((cerr << $ << ";"), ...); }(x),       \
    cerr << "\n"
#else
#define debug(...)                                                             \
  {                                                                            \
  }
#endif

int main()
{
  cin.tie(0)->sync_with_stdio(0);

  // Input
  int n, score = 10;
  string tests;
  cin >> n >> tests;

  // Check tests
  int gs = n / 10;
  REP(i, n)
    if (tests[i] == 'N')
    {
      debug(i, tests[i]);
      score--;
      i += gs - i % gs - 1;
    }

  // Output
  cout << score << "\n";
  return 0;
}