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#include <bits/stdc++.h> 

typedef long long int lli;

using namespace std;

#define MAX4 10010
#define MAX5 100010
#define MAX6 1000010

template <typename T >
void dbg(T last)
{
  cout << last << "\n";
}

template <typename T, typename ...args>
void dbg(T current, args ...next)
{
  cout << current << ' ';
  dbg(next...);
}

//-----------------------------------------------------------------------------------------------//

void solve()
{
  int n;
  string s;
  cin >> n >> s;
  int cnt = n/10;
  int sum = 0;

  for (int i=0;i<10;i++)
  {
    bool good = true;
    for (int j=0;j<cnt;j++)
    {
      if (s[cnt*i+j] == 'N')
      {
        good = false;
        break;
      }
    }

    if (good)
    {
      sum++;
    }
  }

  cout << sum;
}

int main()
{
  std::ios::sync_with_stdio(false);

  solve();

  return 0;
}