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

#define MAXSIZE 100

int main()
{
  int n;
  char s[MAXSIZE];
  
  cin >> n;
  cin >> s;
  int ngr = n / 10;
  int ps = 0, tnum = 0;
  for (int i = 0; i < 10; i++)
  {
    int prop = 0;
    for (int j = 0; j < ngr; j++)
    {
      if (s[tnum] == 'T')
        prop++;
      tnum++;  
    }
    ps += prop / ngr;
  }
  cout << ps << endl;
  // system("pause");
}