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#include <cstdio>

char s[200];

int main()
{
  int n;
  scanf("%d", &n);
  scanf("%s", s);

  int k = 0;  
  int ret = 0;
  for (int i = 0; i < 10; i++)
  {
    int c = 0;
    for (int j = 0; j < n / 10; j++)
    {
      c += (s[k] == 'T');
      k++;
    }
    ret += (c == n / 10);
  }
  
  printf("%d\n", ret);
  
  return 0;
}